Potentiometer Signal Too High
Potentiometer signal too high
Checking status
- Ignition off.
Read off value from the potentiometer for motor 1.
Move the seat forward and backward between the seat end 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 circuit to potentiometer
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Checking resistance in circuit to potentiometer
- Ignition off.
- Remove seat from car according to Replacing seat assembly Replacing Seat Assembly.
- Disconnect the black 14-pin connector C.
Connect an ohmmeter between positions C:12 and C:13 on the black 14-pin connector (potentiometer side).
The ohmmeter should read approximately 2200 ohms.
OK - Checking the supply and signal leads on the potentiometer
Not OK - Checking potentiometer resistance
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Checking potentiometer resistance
- Ignition off.
- Disconnect the black 14-pin connector.
- Remove potentiometer on motor 1.
Connect an ohmmeter between the two outer terminals on the potentiometer.
The ohmmeter should read approximately 2200 ohms.
OK - Checking potentiometer ground lead
Not OK - Replacing component
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Replacing component
Test with a new potentiometer according to Motors and potentiometers underneath seat, replace Removal and Replacement.
Continue - Verification
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Checking potentiometer ground lead
- Ignition off.
- Disconnect the 3-pin (TCM) connector to potentiometer on motor 1.
- Disconnect the black 14-pin connector C.
Connect an ohmmeter between the black 14-pin connector terminal C:12 and the corresponding terminal on the 3-pin connector (brown 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 brown ground lead between the control module, terminal C:12, 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 to the potentiometer on motor 1 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 supply and signal leads on the potentiometer
- Ignition off.
- Disconnect the black 14-pin connector C.
Connect an ohmmeter between the power supply cable, terminal C:13, and the six power supply cables to the motors, terminals C:1-C:6, in the black 14-pin connector (potentiometer side).
Connect an ohmmeter between the signal lead, terminal C:9, and the six supply leads to the motors, terminals C:1-C:6, in the black 14-pin connector (potentiometer side).
Ohmmeter should read infinite resistance for all readings.
OK - Checking control module and connector C
Not OK - Checking for a short-circuit
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Checking for a short-circuit
The measurements show that the signal cable or supply lead to the potentiometer is short-circuited to battery voltage.
Check the red power supply lead between terminal C:13 and the potentiometer on motor 1 for short-circuit to supply according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the red/yellow signal cable between terminal C:9 and the potentiometer on motor 1 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 control module and connector C
Potentiometer and cables are OK.
Check and correct the 14-pin black connector C for contact resistance and oxidation in the contacts 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, replace 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 1.
Adjust the seat front-rear alignment backwards and forwards between the seat ends.
The value from potentiometer 1 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 black 14-pin connector C and the connector on the potentiometer on motor 1 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 C:12 (brown cable), and the potentiometer on motor 1 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 1, terminal C:9 and C:13 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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