Info

Fault, Fault code

3. Connect voltmeter to C 14 (positive) and ground.

4. Push connector C on the heating/air-conditioning control.

5. Connect voltmeter to C 14 (positive) and C 11 (negative).

Minimum blower speed

6. Connect voltmeter to C 14 (positive) and C 16 (negative).

Minimum blower speed Display: approx. 9 V

Connect voltmeter to positive and pin 3 on driver connector. Connect voltmeter to positive and pin 1 on driver connector.

Minimum blower speed Display: approx. 9 V

Connect voltmeter to positive and pin 2 on the driver connector. Maximum blower speed Display: approx. 12 V

Minimum blower speed

8. Check wiring from heating/air-conditioning control to driver

9. Check blower motor.

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Voltage too high Note

A higher blower voltage can only be caused by a short to ground on the wires to pins 1 or 2 of the driver.

1. Unplug connector C from the heating/air-conditioning control.

2. Unplug connector from the driver,

3. Connect ohmmeter to C 16 and ground. Display: °° £2

4. Unplug connector from the fan motor.

5. Connect ohmmeter to driver connector pin 2 and ground. Display: °° Q

Heating diagnosis

911 Carrera (996)

Fault, Fault code

Possible causes, elimination, notes

Test point 13

Control module

Replace the heating/air-conditioning control

Control module faulty Fault code 32

Test point 14

Sun sensor

Diagnosis conditions

No control module fault stored. No fault with supply voltage (5 volts).

Short to B+ Short to ground Fault code 33

Short to B+/ Short to ground

1. Remove sun sensor,

2. Remove plug connection from sun sensor.

Fault, Fault code Possible causes, elimination, notes

3. Connect voltmeter on sleeve side to pin 2 (negative) and pin 3 (positive).

Switch on ignition.

Display: approx. 4.5-5 volts

If 0 volts is displayed, check wiring to the heating/air-conditioning control A 12 and B 18 for continuity.

Check wiring to the heating/air-conditioning control B 18

for short to ground.

Note

The wiring to the heating/air-conditioning unit is routed via two If the wiring is OK, replace the heating/air-conditioning control.

4. Connect ohmmeter to sun sensor pins 2 and 3. Sun sensor not in darkness

Sun sensor in darkness Display: approx. 240 k£2

Erasing the fault memoiy

Note

The fault memory can be erased only if it was first read out at least once.

The entire fault memory is always erased

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