Potentiometer Signal Too Low
Potentiometer signal too low
Checking status
- Ignition off.
Read off the potentiometer value for motor 4.
Adjust the front edge of the seat height adjuster up and down between the seat limit positions several times using the control button.
The potentiometer value must not be below 0.2 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 black 14-pin connector C.
Connect an ohmmeter between terminals C:8 and C:14 on the black 14-pin connector (potentiometer side).
The ohmmeter should read approximately 2,200 ohms.
OK - Checking the potentiometer signal cable
Not OK - Checking potentiometer resistance
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Checking potentiometer resistance
- Ignition off.
- Disconnect the black 14-pin connector.
- Remove the potentiometer on motor 4.
Connect an ohmmeter between the two outer terminals on the potentiometer.
The ohmmeter should read approximately 2,200 ohms.
OK - Checking power supply cable to the potentiometer
Not OK - Replacing the component
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Replacing the component
Try a new potentiometer according to Potentiometer for the front height adjustment motor Potentiometer For the Front Height Adjustment Motor.
Continue - Verification
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Checking power supply cable to the potentiometer
- Ignition off.
- Disconnect the 3-pin connector for the potentiometer on motor 4.
- Disconnect the black 14-pin connector C.
Connect an ohmmeter between the black 14-pin connector terminal C:8 and the corresponding terminal on the 3-pin connector (red cable).
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 red power supply cable between the control module, terminal C:8, 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 4 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 signal cable
- Ignition off.
- Disconnect the black 14-pin connector C.
Connect an ohmmeter between terminals C:8 and C:11 on the black 14-pin connector (potentiometer side).
The ohmmeter should read between 100-2,200 ohms depending on the position of the seat.
OK - Checking the control module and connector C
Low - Checking for a short-circuit
High - Checking for an open-circuit
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Checking for a short-circuit
Check the red / yellow signal cable between terminal C:11 and the potentiometer on motor 4 for short-circuit to the ground lead according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Checking for an open-circuit
Check the yellow / red signal cable between terminal C:11 and the potentiometer on motor 4 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 the control module and connector C
Potentiometer and cables are OK.
Check the 14-pin black connector C for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If the diagnostic trouble code (DTC) 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 4.
Adjust the front edge height adjustment up and down between the seat end position.
The value from potentiometer 4 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 low. Intermittent fault
Checking cables and connectors
Check the black 14-pin black connector C on the control module and the connector on the potentiometer on motor 4 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 red power supply cable between the control module, terminal C:8, and the potentiometer on motor 4 for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check the yellow/red signal cable between the control module, terminal C:11, and the potentiometer on motor 4 for an intermittent short-circuit to ground 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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