Checking the TRACS/STC switch circuit

Checking the TRACS/STC switch circuit

Checking activation with TRACS switch




- Ignition on.
- Read off the status of the TRACS/STC switch
- Press in the TRACS switch and hold it in for approximately 2 seconds. Release the switch and wait approximately 5 seconds and then hold it down for approximately a further 2 seconds.
The status of the TRACS/STC switch should fluctuate when pressed in repeatedly. At the same time check that that the TRACS/STC warning lamp lights and goes out.









Is the status changed?

Yes - No Fault Found

No - Checking the wiring and TRACS/STC switch

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Checking the wiring and TRACS/STC switch




- Ignition off
- Remove the TRACS/STC switch and disconnect it.
Check the wiring between TRACS/STC switch #5 and ground for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the wiring between TRACS/STC switch #1 and combined instrument panel #29 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Hint: With the ignition off and the TRACS/STC switch disconnected the resistance between #1 and #5 on the switch connector should be 0 ohms when pressed in and infinite when the switch is unaffected.
With the ignition on and the TRACS/STC switch disconnected the voltage between #1 on the switch connector and ground should be approximately battery voltage.

Remedy as necessary.

Other information:
- For connecting the breakout box to the combined instrument panel, see Connecting breakout box, Combined instrument panel Connecting the Breakout Box.
- For information about signals, see Pinout Values and Diagnostic Parameters Connector A, #A1 - #A30.

Was a fault detected?

Yes - Verification

No - No Fault Found

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Verification




- Ignition on.
- Read off the status of the TRACS/STC switch
- Press in the TRACS/STC switch and hold it depressed for approximately 2 seconds. Release the switch and wait approximately 5 seconds and then hold it down for approximately a further 2 seconds.
The status of the TRACS/STC switch should fluctuate when pressed in repeatedly. At the same time check that that the TRACS/STC warning lamp lights and goes out.









Is the status changed?

Yes - FAULT FOUND

No - Fault-tracing information

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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 activation with TRACS switch

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