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, Checking the Voltage Supply





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

3 Check that a supply of about 12v is present across pin 8 and chassis ground. If it is not, Checking the Basics

Measure the voltage across pins 8 and 9. It should be about 12v. 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 1 6-pin connector and plug in a BOB.

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

Pin Memory button

7 1
6 2
5 3
16 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
1O-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 Checking the Basics