Cruise Control

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GENERAL 960-1

Test equipment 960-1

ELECTRICAL SWITCHES 960-2

Console mounted switches 960-2

Door contact switch, removing and installing . 960-2 Fog light switch, removing and installing 960-2 Headlight switch, removing and installing 960-3 Horn contact ring, removing and installing ... 960-4

Ignition switch, removing and installing 960-4

Luggage compartment light/alarm switch, removing and installing 960-3

Power mirror selector switch, removing and installing 960-4

Power mirror adjustment switch, removing and installing 960-5

Power window switch, removing and installing 960-5

Steering column switches, removing and installing 960-6

Sunroof switch, removing and installing 960-8

INTERIOR LIGHTS 960-8

Engine compartment bulb, replacing 960-9

Glove compartment bulb, replacing 960-9

Interior light bulb, replacing 960-10

Luggage compartment bulb, replacing 960-10

CRUISE CONTROL 960-11

Troubleshooting 960-11

Cruise control module, removing and installing 960-13

Clutch pedal switch, removing and installing .960-13 Cruise control servo unit, removing and installing 960-14

Cruise control cable, removing and installing 960-14

TABLES

a. Window switch wiring connections 960-6

b. Bulb specifications 960-8

c. Cruise control troubleshooting 960-12

GENERAL

This section covers replacement of electrical switches and interior lights. The cruise control system is also covered here.

See 901 Instruments for dash gauge and instrument repair information.

See 940 Exterior Lighting for exterior light repair information.

See 970 Electrical Wiring Diagrams for information on individual circuits.

Test equipment

^ Electrical and electronic automotive components require the use of low impedance test equipment.

♦ When working on electrical systems, detach negative (-) battery cable. See 030 Maintenance.

• Prior to disconnecting the battery, read the battery disconnection cautions given at the front of this manual on page viii.

Schematic For Fluke

Special tool

A Fluke 87 Automotive digital multimeter

B 1115 LED tester with thin spade probes

(source: Baum Tools Unlimited)

Special Tools il

Special tool

A Fluke 87 Automotive digital multimeter

B 1115 LED tester with thin spade probes

(source: Baum Tools Unlimited)

ELECTRICAL SWITCHES Console mounted switches

The switches mounted in the center console are covered in 680 Interior Trim. This includes the following switches:

• A/C temperature switch

• Hazard warning switch

• Rear window defroster switch

• Central locking switch

Door contact switch, removing and installing

The door contact switches are located in each front door post.

— Disconnect negative (-) battery cable. ^ Remove rubber boot from switch.

— Using an 11 mm socket, unscrew switch and disconnect wire.

— Installation is reverse of removal.

DO NOT allow wire to fall into door pillar.

Fog light switch, removing and installing

— Disconnect negative (-) battery cable.

— Remove fresh air blower and plenum, see 850 Ventilation.

— Unscrew fog light switch knob in counter-clockwise direction.

— Use two-pin spanner wrench to remove switch retaining collar from dashboard.

— Remove switch from behind.

— Label and disconnect wires.

— Installation is the reverse of removal.

Door contact switch assembly

1. Rubber cap

2. Door contact switch

0019421

3. Concave washer

4. Washer

Luggage compartment light/alarm switch, removing and installing

The luggage compartment light switch is located on the right side hinge, between the hinge bolts. A copper connector is crimped to the wire and to the switch.

— Disconnect negative (-) battery cable. Unscrew switch retaining nut (arrow) from hinge.

— Remove copper connector wire from switch and remove switch.

DO NOT allow wire to fall into hood.

— Installation is reverse of removal.

Headlight switch, removing and installing

— Disconnect negative (-) battery cable.

— Pry out plastic center from rubber headlight switch knob.

— Unscrew nut and remove headlight switch knob.

^ Using a small spanner in retaining ring holes (arrows) remove the retaining ring and push switch out.

— Remove switch from below dashboard.

— Label and disconnect wires.

— Installation is reverse of removal.

1984 Porsche 911 Horn Pic

0019514

Porsche 964 Dashboard Removal

0019430

Horn contact ring, removing and installing

— Disconnect negative (-) battery cable.

— Remove steering wheel, see 480 Steering.

^ Remove horn contact ring mounting screws (arrows) and contact ring.

— Installation is the reverse of removal.

Ignition switch, removing and installing

— Remove left side knee protection trim from dashboard.

— Working under dashboard, remove electrical wiring harness from ignition switch.

— Remove ignition switch mounting screws and remove from ignition/steering lock mechanism.

See 480 Steering for additional information on the steering lock.

Power mirror selector switch, removing and installing

The power mirror selector switch is located above the ignition switch to the right of the sunroof switch (if applicable). This switch selects which mirror (driver or passenger side) is selected for adjustment with the mirror adjustment switch.

— Disconnect negative (-) battery cable.

— Use a plastic pry tool or other blunt tipped object to pry the temperature/oil pressure gauge out of the dashboard.

1984 Porsche 911 Mirror Wiring

0019519

1984 Porsche 911 Mirror Wiring

0019516

^ Working in luggage compartment, pry out switch retaining tabs (arrow) while pushing switch down out of dashboard.

— Disconnect harness connector.

— Install switch by pushing back up into dashboard.

Power mirror adjustment switch, removing and installing

— Disconnect negative (-) battery cable.

— Remove mirror adjustment switch knob by pulling upward. ^ Unscrew switch retaining ring (arrow).

— Remove upper door panel trim.

— Disconnect harness connector and remove mirror adjustment switch.

— Installation is reverse of removal.

Power window switch, removing and installing

— Disconnect negative (-) battery cable.

Prior to disconnecting the battery, read the battery disconnection cautions given at the front of this manual on page vii.

Loosen and/or remove enough door panel mounting hardware to pull front part of panel away from door. See 570 Doors for more information.

1984 Porsche 911 Mirror Wiring

0019518

1989 911 Window Switches

Table a. Window switch wiring connections

Switch Terminal

Left window driver's door switch

Right window driver's door switch

Right window passenger door switch

1

Blue

Red / white

Blue

2

Blue / black

Red / black

Blue / black

3

Single red / blue

Single red / blue

Red / white

4

Brown

Brown

Brown

5

Double red / blue

Double red / blue

Red / black

^ Push out power window switch from behind door panel while depressing spring tabs on top and bottom of switch (arrows).

— Pull rubber boot back and disconnect wires from switch.

— Installation is the reverse of removal.

Table a. Window switch wiring connections

Steering column switches, removing and installing

The turn signal/headlight dimmer switch, windshield wiper/washer switch and cruise control switch are all mounted on the steering column.

— Disconnect negative (-) battery cable.

— Working inside passenger compartment, remove steering wheel as described in 480 Steering.

Remove steering column cover outer mounting screws (arrows) located on sides of cover.

Screws are located behind switch arms.

0019143

1984 Porsche 911 Horn Pic

^ Remove horn contact plate mounting screws (arrows).

• Disconnect ground wire from back of plate.

0019143

1984 Porsche 911 Horn Pic

^ Remove steering column cover inner mounting screws (arrows). Remove covers.

Ground wire connection is on lower right screw (A).

1985 Porsche 911 Turn Signal Wiring

Unplug switch wiring harness (arrows) for appropriate switch from underneath dashboard.

Harness connector for cruise control switch is not shown in illustration. Follow wires down to right of steering column to locate harness connector.

1984 Porsche 911 Horn Pic

To remove turn signal switch from column:

• Remove small mounting screws (arrows on left side).

To remove windshield wiper/washer switch or cruise control switch from column:

• Remove small mounting screws (arrows on right side).

— Installation is reverse of removal.

• Tighten mounting screws, then lock in place with lacquer or paint.

• Reattach harnesses with new wire tires.

• When installing steering column covers, be sure to anchor ground wire under lower right cover screw.

Tightening Torque

• Steering wheel to steering column 50 Nm (36 ft-lb)

Sunroof switch, removing and installing

— Disconnect negative (-) battery cable.

— Use a blunt tipped screwdriver to pry the temperature/oil pressure gauge out of the dashboard.

^ Reach through gauge opening and push sunroof switch (arrow) downward out of dashboard.

— Disconnect harness connector.

— Install switch by pushing back up into dashboard.

INTERIOR LIGHTS

General

The dome lights for the coupe are located over each door and can be operated by simply tilting the lens face. The glove compartment light is located in the dash above the glove compartment door. A switch in the dash is released when the glove compartment door is opened that turns on the light. Both the dome and glove compartment light can be set to operate by the door contact switches.

The targa and cabriolet use one interior light located above the windshield between the sun visors. The light has a built-in three position rocker switch which is operated by pressing on the lens.

The various interior light bulb specifications are provided in Table a.

Table b. Bulb Specifications

Location

Rating

DIN (SAE) number

Passenger compartment and trunk

10W

BA 15s

Instruments, ashtray

2 W

BA 7

Glass base indicator lamp

1.2 W

W2 X 4.6d

Sign light (USA only)

1.2 W

Use only original equipment replacement bulbs.

Use only original equipment replacement bulbs.

2007 Maybach Fuel Pump

0019515

Engine compartment bulb, replacing

The engine compartment light is located in the center of the engine compartment lid. The sliding bulb cover is also an on/off switch. The engine compartment light operates only when the headlights are on.

— Disconnect negative (-) battery cable.

^ Pull housing cover off light assembly at arrows.

It may be necessary to pry off the housing cover with a small screwdriver.

— Rotate bulb cover/switch to expose bulb.

— Installation is reverse of removal.

Glove compartment bulb, replacing

The glove compartment light is located in the dashboard, directly above the glove compartment. The light has a built-in three position rocker switch which is operated by pressing on the lens.

— Disconnect negative (-) battery cable.

— Insert screwdriver in cut-out on light housing and carefully pry out light assembly.

— Remove bulb from between contacts.

— Install new bulb and press light into place.

Porsche 911 1984 Dash Board

CATAits:

Interior light bulb, replacing

— Disconnect negative (-) battery cable.

^ Insert screwdriver into front of light bulb housing and carefully pry out interior light assembly.

— Remove bulb from between contacts.

— Install new bulb and press interior light into place.

Luggage compartment bulb, replacing

The luggage compartment light is installed in the luggage compartment lid near the windshield, on the right.

Remove two mounting screws (arrows) and remove light from lid.

— Slide bulb holder out of the lens.

— Remove bulb from socket.

— Installation is reverse of removal.

CAUTION—

Align plastic gasket before installing light.

Speedometer Removal 911
0019440
Cruise Control Servo Porsche 968

0019400

Cruise Control Power Servo

CRUISE CONTROL

^ The cruise control system consists of an electronic control unit, a cruise control servo, a control switch on the steering column, and switches at the brake and clutch pedals.

The control module uses a signal from the speedometer to compare the car's true speed to the speed selected by the driver via the column switch. The control unit then signals the servo to open or close the throttle via a cable.

The system will maintain the set speed while going up and down hills within the engine's power range. The set speed can be increased at any time by depressing the accelerator pedal. When the accelerator pedal is released the vehicle speed will return to the previously set speed. If either the clutch or brake pedal are depressed the system will be disengaged. If the vehicle speed drops below 15 mph at any time the system will automatically disengage.

To disengage cruise control when the clutch pedal is depressed, a clutch pedal switch is used. To disengage cruise control when the brakes are used an extra connection at one of the brake light switches is used.

Cruise control switch removal and installation is covered earlier in this group under Steering column switches, removing and installing.

Troubleshooting

— When troubleshooting cruise control system, first check for a faulty fuse 6 in the fuse/relay panel in luggage compartment.

— To begin troubleshooting cruise control components and electrical circuit, access cruise control module as described later.

• Remove fresh air plenum in luggage compartment.

• Detach electrical harness connector at cruise control module.

— If no faults are found with cruise control components or electrical circuits, replace cruise control module.

Table c. Cruise control troubleshooting

Test

(terminals at cruise control module harness connector)

Results

Probable cause

Connect ohmmeter between terminal 3 and ground

Meter reads infinite £2

None

Depress clutch pedal

Meter reads approx. 10 £2

None

Meter reads infinite Q

Clutch pedal switch or servo unit faulty

Connect ohmmeter between terminals 3 and 7

Meter reads 11 -17 £2

None

Meter reads <11 £2 or >17 £2

Servo unit faulty

Connect ohmmeter between terminal

12 and ground

Meter reads 0 £2

See wiring diagram in 970 Electrical Wiring Diagrams

Connect ohmmeter between terminal 11 and ground. Turn rear wheels

Meter deflects

None

Meter does not deflect; speedometer functions

Wiring between cruise control module and speedometer faulty

Meter does not deflect; speedometer does not function

Speedometer sensor at transmission faulty or wiring from speedometer sensor faulty

Connect ohmmeter between terminal 6 and ground

Meter reads infinite £2

None

Meter reads 0 Q

Brake light switch faulty

Connect voltmeter between terminal 6 and ground, turn ignition on Depress brake pedal

Meter reads battery voltage

None

Battery voltage not present

Brake light switch faulty

Connect voltmeter between terminal 9 and ground Push up on column switch

Meter reads battery voltage

None

Battery voltage not present

Fuse 6 faulty

Connect voltmeter between terminal 8 and ground Pull column switch toward steering wheel

Battery voltage not present

None

Meter reads battery voltage

Cruise control column switch faulty

Connect voltmeter between terminal 10 and ground Push column switch down

Meter reads battery voltage

None

Battery voltage not present

Cruise control column switch faulty

W124 Cruisecontrol Module Not Working

Cruise control module, removing and installing

Working in luggage compartment, remove fresh air plenum cover in luggage compartment.

— Pull electrical harness connectors off module.

— Remove phillips head screw (arrow) and remove module.

— Installation is reverse of removal.

Clutch pedal switch, removing and installing

Working inside passenger compartment at the pedals, remove accelerator pedal mounting screws (A) and remove pedal.

— Remove pedal cluster cover after removing carpet securing straps at top and fastener at bottom (arrows).

0019770

^ Remove clutch pedal switch bracket fasteners, disconnect wires and remove bracket with switch.

— Installation is reverse of removal.

• Make sure switch is adjusted correctly for clutch pedal. Use adjusting slots so that switch is not damaged when pulling back clutch pedal to check clutch play.

911 Heater Controls

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Cruise Control Servo Porsche 968

Cruise control servo unit, removing and installing

— Working inside engine compartment on left side of engine, remove hose between heater blower motor and heater distribution pipe.

^ Disconnect cruise control servo electrical harness connector (A).

— Working at throttle assembly:

• Detach cruise control cable attachment bracket from throttle lever.

• Slide plastic cable housing end out of holder bracket.

— Remove servo mounting screws. Remove servo with cable.

— Installation is reverse of removal.

W124 Cruisecontrol Module Not Working

Cruise control cable, removing and installing

— Working at throttle assembly:

• Detach cruise control cable attachment bracket from throttle lever.

• Slide plastic cable housing end out of holder bracket.

— Working inside engine compartment on left side of engine, remove hose between heater blower motor and heater distribution pipe.

Working at cruise control servo, remove screws holding cable end flange to vacuum diaphragm at cruise control servo.

To disconnect cable from servo, squeeze plastic retainer clip and push forward to release cable.

— Remove plastic clip from cable. Remove flange from cable.

— Installation is reverse of removal.

• Be sure there are no kinks in cable.

• Make sure there is as little slack as possible in cable at throttle end.

• With engine off, there should be no tension on cable.

• Use plastic hexagon nut at throttle housing end of cable to adjust cable tension.

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