Important vehicle information

- Always turn off the ignition or disconnect the battery for resistance measurements (if this is not done, the measuring device could be destroyed).

- Disconnect the control unit connector from the control unit only when the ignition is switched off.

- Do not disconnect the battery when the engine is running.

- Never use a starting aid with more than 16 V or a boost battery charger.

- Depressurize the system first when working on the lock hydraulics.

- If the battery has been disconnected, system adaption must be performed subsequently (DME menu-system adaption).

It is possible to test braking efficiency on a single-roller test stand with switched-off ignition. The roller speed must, however, be below 13 km/h.

In order to obtain sufficient brake force boosting, the brake must be operated as often as required directly before the test with the ignition switched on until the hydraulic pump starts running and fills up the pressure accumulator. Approx. 3...5 braking operations are then possible on the test stand with the ignition switched off.

- Towing: Permitted only on all 4 wheels

Legal regulations which deal with towing must be observed. Switch on the ignition for this purpose.

The traction program must be switched off. To check this, turn the full-lock switch (traction switch in the center console) to the left.

Use the screw-in towing lug supplied with the vehicle tools.

PDAS diagnosis_w¡th system tester 9288


The PDAS/ABS control unit is capable of self-diagnosis. In other words, the control unit can detect, store and output certain faults from the PDAS and ABS.

Diagnosis is performed with the system tester 9288. The tester 9268 cannot be used.

Continuous positive is present at the PDAS/ABS control unit so that faults which have been detected and stored are not cleared when the ignition is switched off.

Possible uses of the system tester 9288 for PDAS

Reading out the fault memory, clearing the fault memory

Bleeding the locks (Rep. Gr. 47)

Testing the longitudinal and transverse locks (locking torque)

Connection of the 9288 and procedure


PDAS diagnosis with the system tester 9288 must be performed with the ignition switched on and the vehicle stationary.

1. Tester 9288 in conjunction with connecting cable 9288/1 (adapter cable)

Connect at the diagnosis socket in the passenger footwell (under the cover).


Testing the full-lock switch (traction switch in the center console)


2. Switch on ignition and tester. It is possible to switch on the tester by means of any key. The operating instructions of the tester 9288 are contained in Repair Group 03.

3. Select vehicle type and then the system (PDAS).


If the following display appears:

No data exchange possible

Abort: N

If no PDAS appears in the display "built-in systemsthis may have the following cause:

Engine running

- Voltage supply for the control unit interrupted

Ground missing

K-lead or L-lead from diagnosis unit not ok Control unit faulty

4. Menu selection

Possible PDAS menus/explanation

1 = Fault memory

Read out fault memory/ fault elimination Clear fault memory

2 = Drive links


Testing transverse lock Testing longitudinal lock

3 = Input signals

Full-lock switch test

(Traction switch in center console)

5. Information on desired menu Menu 1 = Fault memory: As from page D39/45-12 Menu 2 = Drive links Bleeding: in repair group 47 Testing transverse and longitudinal locks: Test point 4, refer to P. D39/45-1 (next supplement) Menu 3 = Input signals Full-lock switch test: Next supplement for troubleshooting under No. 19 (troubleshooting No. 1 as from page D39/45-13).

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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