Checking Control Panel

Checking control panel

Checking control button, legroom

- Ignition off.
Read off control button status.
Move the seat forward and backward using the control button.

The status should change from NOT ACTIVE to ACTIVE when activation occurs.

OK - Checking control button, backrest adjustment

Not OK - Checking contact resistance and oxidation

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Checking control button, backrest adjustment

- Ignition off.
Read off control button status.
Adjust the seat backrest backward and forward with the control button.

The status should change from NOT ACTIVE to ACTIVE when activation occurs.

OK - Checking control button, rear edge of seat adjustment

Not OK - Checking contact resistance and oxidation

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Checking control button, rear edge of seat adjustment

- Ignition off.
Read off control button status.
Adjust the rear seat edge height adjustment up and down with the control button.

The status should change from NOT ACTIVE to ACTIVE when activation occurs.

OK - Checking control button, front edge of seat adjustment

Not OK - Checking contact resistance and oxidation

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Checking control button, front edge of seat adjustment

- Ignition off.
Read off control button status.
Adjust the front seat edge height adjustment up and down with the control button.

The status should change from NOT ACTIVE to ACTIVE when activation occurs.

OK - Checking memory buttons

Not OK - Checking contact resistance and oxidation

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Checking memory buttons

- Ignition off.
Read off memory buttons status.
Activate the four memory buttons, one at a time.

The status should change from NOT ACTIVE to ACTIVE when activation occurs.

OK - No Fault Found

Not OK - Checking contact resistance and oxidation

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Checking the control buttons status

- Ignition off.
Activate the seat functions in both directions with the control buttons and read off the status of each button.
Activate the four memory buttons and read off the status.

The status for all the functions should change from NOT ACTIVE to ACTIVE when they are activated.

OK - No Fault Found

Not OK - Checking contact resistance and oxidation

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Checking contact resistance and oxidation

- Ignition off.
- Disconnect the 16-pin connector B.
Remedy the 16-pin connector for loose connections according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults and contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Continue - Connecting the breakout box

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Connecting breakout box
981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 981 3194 Replaced by 9511495 981 3194 Replaced by 951 1495

Information

Connecting up the Test box

Is the test box connected to the control module?

Yes - CONNECTED

No - NOT CONNECTED

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NOT CONNECTED -

CONNECTED - FAULT FOUND

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Check ground points

- Ignition off.
- Connect breakout box 981 3190 with adapter 981 3194 to 16-pin yellow (or green) connector (output 31-46). 981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 981 3194 Replaced by 9511495 981 3194 Replaced by 951 1495

- Measure with ohmmeter between battery negative pole and:
- connection 36 on breakout box.
- connection 37 on breakout box.

In both cases the ohmmeter should read 0 ohms.

OK -

Not OK -

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Calibrating ground terminals, continued

- Ignition off.

- Connect an ohmmeter between battery negative terminal and terminal A:3 on the 4-pin connector.

The ohmmeter should read approx. 0 ohms.

OK - FAULT FOUND

Not OK -

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Checking for an open-circuit

- Check lead between controller and control module connection D:6 or D:7 for break as per HA6 . Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Continue - FAULT FOUND

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Checking for an open-circuit, contact resistance and oxidation

- Check lead between control module connection 31 and control point for break as per HA2 as well as contact resistance and oxidation as per HA5 . Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.

Continue - FAULT FOUND

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FAULT FOUND - Checking control buttons

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Checking control buttons

- Ignition off.
Connect an ohmmeter between the breakout box terminal to the relevant button and ground (terminal 36). See Connector D Connector D.

The ohmmeter should read 0 ohms when the button is pressed.

OK - Checking the control module
Checking the control module

Not OK - Checking for an open-circuit

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Checking for an open-circuit
Check cables between control panel and control module for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If faulty, try a new control panel according to Control panel Control Panel.

Continue - Verification
Verification

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Replacing the component
Try a new control module according to Control module Control Module.

Continue - Verification

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Fault-tracing information
The control panel is operating correctly. The symptom was probably caused by contact resistance in the terminals.

Continue - FAULT FOUND

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Checking the control module

- Ignition off.
Read off control button status.
Move the seat forward and backward using the control button.

The status should change from NOT ACTIVE to ACTIVE when activation occurs.

OK - Checking control module, continued

Not OK - Replacing the component

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Checking control module, continued

- Ignition off.
Read off control button status.
Adjust the seat backrest backward and forward with the control button.

- Ignition off.
Read off control button status.
Adjust the rear seat edge height adjustment up and down with the control button.

- Ignition off.
Read off control button status.
Adjust the front seat edge height adjustment up and down with the control button.

- Ignition off.
Read off memory buttons status.
Activate the four memory buttons, one at a time.

The status should change from NOT ACTIVE to ACTIVE when activation occurs.

OK - Fault-tracing information

Not OK - Replacing the component

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Verification

Verification

Hint: After repairs have been completed they must be verified as follows to ensure that the fault has been eliminated:

Verify those functions which were faulty.
1. Seat adjustment front-rear
2. Backrest adjustment
3. Seat height adjustment (rear)
4. Seat height adjustment (front)
5. Memory functions

Select an alternative that describes the situation.

1 - Verifying control button, legroom

2 - Verifying control button, backrest adjustment

3 - Verifying control button, seat rear edge adjustment

4 - Verifying control button, seat front edge adjustment

5 - Verification of memory buttons

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Verifying control button, legroom

- Ignition off.
Read off control button status.
Adjust the seat front-rear alignment backwards and forwards with the control button.

Status should change from NOT ACTIVE to ACTIVE when activation occurs.

OK - Fault-tracing information

Not OK - VERIFICATION FAILED

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Verifying control button, backrest adjustment

- Ignition off.
Read off control button status.
Adjust the seat backrest backwards and forwards with the control button.

- Ignition off.
Read off control button status.
Adjust the rear seat edge height adjustment up and down with the control button.

- Ignition off.
Read off control button status.
Adjust the front seat edge height adjustment up and down with the control button.

- Ignition off.
Read off memory buttons status.
Activate the four memory buttons, one at a time.

Status should change from NOT ACTIVE to ACTIVE when activation occurs.

OK - Fault-tracing information

Not OK - VERIFICATION FAILED

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Fault-tracing information

Were there more faulty functions needing verification?

Yes - Verification

No - VERIFIED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - FAULT FOUND

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Fault-tracing information

Information

Fault-tracing information
The fault should be diagnosed and remedied. Since this is not the case the fault-tracing process has failed.
Complete the fault-tracing for those fault or try again.

Do you want to terminate fault-tracing at this time?

Yes - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking control button, legroom

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