Switch Panels and Manual Control
Connectors H10-26 Exist (M95 current, M96-)
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 is intact.
- Check that fuse 7 is intact.
- Also check that there is voltage from the relevant fuse 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 fault diagnosis using wiring diagram.
2 Checking the voltage supply to the switches.
- Unfasten the 10 pole connector to the switch.
- Ignition timing in the ON position.
- Check that there is voltage to pin 10 of the sensor connector with the test lamp.
- Connect the test lamp between pin 10 and a definite grounding point.
- The test lamp should come on.
Does the test lamp come on?
YES Continue with point 4.
NO Continue with point 3.
3 Checking the wiring harness.
- Carry out a continuity test on the cables.
- Electronic control module -M95, M96 current:
Pin 8 of the electronic control module connector and pin 10 of the 10 pole connector.
Connector H3-10 (LHD) or H3-11 (RHD) pin 3 and fuse 25 or the corresponding connector pin 2 or fuse 7
- Electronic control module M96 current:
Electronic control module connector A pin 1 and switches 10 pole connector pin 10.
The electronic control module connector B pin 6 and fuse 25 or corresponding electronic control module pin 1 or fuse 7.
Is the wiring correct?
YES Continue with point 5.
NO Rectify the defective cable.
4 Checking the switches.
- Take a resistance reading from the switch including the cable and the connector.
- Connect the ohmmeter the 10 pole connector for the switches between pin 10 and pin 6 or pin 7.
- Operate the seat fore-and-aft and read the corresponding resistance values.
The ohmmeter should display OL For an inactivated switch and for a closed switch display <5 Ohm.
Is the resistance correct?
YES Continue with point 5.
NO Check and possibly rectify the wiring harness including the connectors. If the cables are not faulty, 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 at the memory switch panel and the electronic control module.
- Internal fault in the memory switch panel so the switch in unable to close.
- Fault in the electronic control module.
Diagnostic Procedure
1 Memory switch panel operation check.
- Unfasten the memory switch panel connector.
- Ignition timing in the on position.
- Loop in the sensor connector between pin 2 and the following pin depending on the fault.
Memory button Pin
1 7
2 3
3 5
M 6
- The function should operate after looping.
Do the operations function?
YES Change the memory switch panel.
NO Check and possibly rectify the wiring harness (including the connector) between the electronic control module connector A (Pin 2, 3, 4 and <#01 02>18) and the memory switch panel sensor connector (Pin 7, 3, 5 And 6). If the wiring harness has no faults, continue with point 2.
2 Switch operation check.
- Unfasten the 10 pole connector to the switch.
- Ignition timing in the ON position.
- Loop in the sensor connector between pin 10 And the following pin depending on the fault symptom.
Pin
9 - backrest forwards
8 - backrest backwards
2 - front edge downwards
3 - front edge upwards
4 - rear edge downwards
5 - rear edge upwards
6 - seat forwards
7 - seat backwards
- The function should operate after looping.
Does the function operate?
YES Check And possibly rectify the wiring harness (including the connector) for the switches. If the wiring harness has no faults, change the switch.
NO Continue with point 3.
3 Checking the wiring harness.
- Electronic control module -M95, M96 current:
Check the wiring harness between the electronic control module connector and the 10 pole connectors for the switches.
- Electronic control module M96 current:
Make a continuity test of the wiring harness between the electronic control module A and the 10 pole connector of the switches.
Is the wiring harness free of faults?
YES Continue with point 4.
NO Rectify the fault.
4 Final inspection.
- Complete Operation Check
Fault Symptom 3
- The seat does not operate with the front doors open.
- No diagnostic trouble code.
Feasible Fault Causes
- Open circuit in the link between the door switch, lighting and the electronic control module.
- Faulty door switch, lighting.
- Fault in the electronic control module.
Diagnostic Procedure
1 Checking the door switch.
- Open the relevant front door.
- Check if the interior lighting comes on.
Does the interior lighting come On?
YES Continue with point 2.
NO Check the door switch grounding point. If it is without faults, change the door switch.
2 Checking the electronic control module intake.
- Unfasten the connector pins to the door switch.
- Loop in the connector pin with a definite grounding point.
- Check that the front seat operates.
Does the front seat operate?
YES Check and possibly change the door switch.
NO Continue with point 3.
3 Checking the cables to the electronic control module.
- Make a continuity check of the cable between the door switch and the electronic control module.
Is the wiring correct?
YES Continue with point 4.
NO Rectify the fault.
4 Final inspection
- Complete Operation Check