Without Connector H10-26
Important: The current M95 has a 10 pole connector, H10-26, between the electronic control module and the manual control switch. The current introduction has no release date and lacks a chassis number limitation so fault diagnosis is based on whether connector H10-26 is present or not.
Fault Symptom 1
- The seat does not operate.
- No diagnostic trouble code.
- All the switches on the ISAT scan tool display "OPEN".
Feasible Fault Causes
The manual control unit and the memory switch panel lack +30 voltage supply or +54 voltage supply.
Diagnostic Procedure
1 Check the fuses.
- Check that fuse 25 (driver seat) and fuse 26 (passenger seat) have not blown.
- Check that fuse 7 is intact.
- Also test that there is voltage from the relevant fuses with the test lamp.
- Connect the test lamp across the relevant fuse and a definite ground.
- The test lamp should come on.
Does the test lamp come on?
YES Continue with point 2.
NO Continue the fault diagnosis using wiring diagram.
2 Checking the voltage supply at the electronic control module sensor connector.
- Unfasten the electronic control module sensor connector and engage the BOB. Only connect the electronic control module sensor connector and not the sensor connector to the switch.
- Connect the test lamp between pin 8 and a definite grounding point.
- The test lamp should come on.
Does the test lamp come on?
YES Continue with point 3.
NO Check and possibly rectify the wiring harness including the connector H3-1O (LHD) or H3-11 (RHD) pin 2 and pin 3 and the respective fuse 7 and fuse 25. If the wiring is without fault, continue with point 5.
3 Checking the ground connection at the electronic control module sensor connector.
- Connect the test lamp between pin 8 and pin 9.
- The test lamp should come on.
Does the test lamp come on?
YES Continue with point 4.
NO Check and possibly rectify the cables between connector H3-1O (LHD) or H3-11 (RHD) pin 1 and grounding point G14 and G24. If the cables are without fault, continue with point 5.
4 Checking the switches.
- Connect the switch sensor connector to the BOB.
- Connect the test lamp between:
pin 12 and pin 9
pin 3 and pin 9
- Drive the seat in foreman aft directions.
- The test amp should come on when the manual control is effected.
Does the test lamp come on?
YES Continue with point 5.
NO Change the switch.
5 Final inspection.
- Complete Operation Check
Fault Symptom 2
- The seat does not operate in certain positions.
- No diagnostic trouble code.
- Some of the switches on the ISAT display "OPEN".
Feasible Fault Causes
- Open circuit in the link between the particular switch and the switch panel or the switch and the electronic control module.
- Internal fault in the switch panel or switch so the switch contact can not close.
- Fault in the electronic control module.
Diagnostic procedure
1 Memory switch panel operation check.
- Unfasten the electronic control module sensor connector.
- Engage BOB
- Loop in BOB between pin 8 And the following pins depending on the fault.
Memory button Pin
1 7
2 6
3 5
M 16
Do the operations function?
YES Check and possibly rectify the wiring between the electronic control module voltage supply pin and the relevant pin on the switch panel. If the wiring is without fault, change the memory switch panel and continue with point 2.
NO Continue with point 3
2 Check the voltage supply to the manual control unit.
- Loop in BOB between pin 8 and the following pin depending on the fault symptom.
Pin 1 - backrest forwards
2 - backrest backwards
3 - front edge downwards
4 - front edge upwards
10 - rear edge downwards
11 - rear edge upwards
12 - seat forwards
13 - seat backwards
Does the seat operate as desired?
YES Check the cables between the switch and the electronic control module with regards for open or short circuits. If the cables are without fault, change the switch.
NO Continue with point 3.
3 Final inspection.
- Complete Operation Check