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Checking the operation of pushbuttons and manual controls

Symptom: Seat cannot be operated in certain positions. No diagnostic trouble code. One of the "Read switches" in the ISAT shows "Open".

Checking the operation of pushbuttons and manual controls



Fault symptom:




Seat cannot be operated.

No diagnostic trouble code.

All "Read switches" in the ISAT show "open".




Diagnostic procedure:




1. Check that the control module is supplied with power,

2. Unplug the control module's 16-pole connector and plug in a BOB.

3. Check that a supply of about 12 V is present across pin 8 and chassis ground. If it is not .

4. Measure the voltage across pins 8 and 9. It should be about 12 V. If it is not, check the ground cable (pin 9) for continuity/shorting.




Fault symptom:


Seat cannot be operated in certain positions.


No diagnostic trouble code.

One of the "Read switches" in the ISAT shows "Open".




Diagnostic procedure:


1. Unplug the control module's 16-pole connector and plug in a BOB.

2. Connect the BOB between pin 8 and the following pins, depending on the fault:

Pin 7 - memory button 1 Pin 6 - memory button 2 Pin 5 - memory button 3 Pin 16 - memory button M

If entire functions are inoperative, check the wiring between pin 8 of the control module and pin 1 of the pushbutton assembly.

3. Connect a jumper lead between pin 8 and


pin 1 - backrest upright 2 - backrest recline 3 - front down 4 - front up 10 - rear down 11 - rear up 12 - seat forwards 13 - seat rearwards


If the seat moves as desired, change the pushbutton assembly or the switch assembly.

4. If the seat does not move, check the wiring between the switch and the control module for continuity/shorting.

5. Turn to page 852-55, "Before control module replacement".