Potentiometer Too High
Potentiometer too high
Checking status
- Ignition off.
Read off the potentiometer value for motor 2.
Adjust the seat backrest forward and backward between the seat limit positions several times using the control button.
The potentiometer value must not exceed 4.6 V at any time.
OK - Intermittent fault
Not OK - Checking resistance in the potentiometer circuit
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Checking resistance in the potentiometer circuit
- Ignition off.
- Remove the seat from the car according to Lifting the power seat in and out Lifting the Power Seat In and Out.
- Disconnect the gray 14-pin connector B.
Connect an ohmmeter between terminals B:4 and B:5 on the gray 14-pin connector (potentiometer side).
The ohmmeter should read approximately 2,200 ohms.
OK - Checking the potentiometer supply and signal cables
Not OK - Checking potentiometer resistance
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Checking potentiometer resistance
- Ignition off.
- Disconnect the gray 14-pin connector.
- Remove the potentiometer on motor 2.
Connect an ohmmeter between the two outer terminals on the potentiometer.
The ohmmeter should read approximately 2,200 ohms.
OK - Checking potentiometer ground lead
Not OK - Replacing the component
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Replacing the component
Try a new potentiometer according to Replacing the backrest motor and potentiometer Replacing the Backrest Motor and Potentiometer.
Continue - Verification
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Checking potentiometer ground lead
- Ignition off.
- Disconnect the 3-pin connector for the potentiometer on motor 2.
- Disconnect the gray 14-pin connector B.
Connect an ohmmeter between the gray 14-pin connector terminal B:4 and the corresponding terminal on the 3-pin connector (yellow / white wire).
The ohmmeter should read approximately 0 ohms.
OK - Checking contact resistance and oxidation
Not OK - Checking for an open-circuit
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Checking for an open-circuit
Check the yellow / white ground lead between the control module terminal B:4, and the potentiometer for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Checking contact resistance and oxidation
Check the 3-pin connector for the potentiometer on motor 2 for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Checking the potentiometer supply and signal cables
- Ignition off.
- Disconnect the gray 14-pin connector B.
Connect an ohmmeter between the power supply cable, terminal B:5, and the two power supply cables to the motor, terminals B:1 and B:2, in the gray 14-pin connector (potentiometer side).
Connect an ohmmeter between the signal cable, terminal B:1, and the two power supply cables to the motor, terminals B:2 and B:3, in the gray 14-pin connector (potentiometer side).
Ohmmeter should read infinite resistance for all readings.
OK - Checking the control module and connector B
Not OK - Checking for a short-circuit
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Checking for a short-circuit
The readings show that there is a short-circuit to battery voltage in the signal cable or power supply cable to the potentiometer.
Check the blue / white power supply cable between terminal B:5 and the potentiometer on motor 2 for a short-circuit to supply according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the white signal cable between terminal B:3 and the potentiometer on motor 2 for short-circuit to supply according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Checking the control module and connector B
Potentiometer and cables are OK.
Check the 14-pin gray connector B for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If the fault persists after verification, try a new control module according to Control module Control Module.
Continue - Verification
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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:
- Ignition off.
- Reinstall components, reconnect connectors etc.
- Connect seat to car..
Read off the value from the potentiometer on motor 2.
Adjust the seat backrest forwards and backwards between the seat end positions.
The value from potentiometer 2 must not exceed 4.6 V or fall lower than 0.2 V at any time.
OK - VERIFIED
Not OK - VERIFICATION FAILED
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VERIFIED - FAULT FOUND
VERIFICATION FAILED - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.
Do you want to exit fault-tracing?
Yes - Exit fault-tracing
No - Attempt New Test
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Attempt New Test - Checking status
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Intermittent fault
Potentiometer signal too high. Intermittent fault
Checking cables and connectors
Check the gray 14-pin connector B and the connector on the potentiometer on motor 2 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. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check the ground lead between the control module, terminal B:4 (yellow/white cable), and the potentiometer on motor 2 for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check the signal and power supply cables between the control module and the potentiometer on motor 2, terminal B:3 and B:5 for an intermittent short-circuit to supply voltage according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Continue - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).
Do you want to view the information again?
Yes - Attempt New Test
No - FAULT FOUND
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Attempt New Test - Checking status
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