ABS-142
Fault in circuit. Permanent fault
Checking stop (brake) light status
- Ignition on.
- Go into scrolling values, list 3.
Read off stop (brake) lamp switch) position.
With the brake pedal up this value should be OFF. With the brake pedal depressed this value should be ON.
Is the value ON at all times?
Yes - Checking the stop (brake) light switch
No - Checking the stop (brake) light
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Checking the stop (brake) light switch
- Remove soundproofing.
- Ignition on.
- Go into scrolling values, list 3.
Disconnect stop (brake) lamp switch and read off stop (brake) lamp switch position.
Does the value change to OFF?
Yes - Checking stop (brake) lamp switch adjustment
No - Checking for a short-circuit
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Checking for a short-circuit
Check cable between control module #12 and stop (brake) lamp switch connector terminal 2 and cable to stop (brake) lamp for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
On vehicles with automatic transmission: Check cable between stop (brake) lamp switch connector terminal 2 and automatic transmission control module (TCM) #B26 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Select "Continue" when the fault has been repaired.
Continue - Verification
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Checking stop (brake) lamp switch adjustment
Hint: The stop (brake) lamp switch is automatically adjusted.
- Remove and set stop (brake) lamp switch according to Replacing stop (brake) light switch later type Service and Repair for a new initial setting.
- Connect stop (brake) light switch.
- Brake pedal up.
- Ignition on.
- Go into scrolling values, list 3.
Read off stop (brake) lamp switch) position.
With the brake pedal up this value should be OFF.
OK - Cause of fault
Not OK - Replacing component
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Cause of fault
The cause of the diagnostic trouble code (DTC) has been incorrect adjustment of the stop (brake) light switch.
Select "Continue"
Continue - Verification
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Replacing component
Try a new stop (brake) lamp switch according to Replacing stop (brake) light switch later type Service and Repair.
Select "Continue" when the component has been replaced.
Continue - Verification
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Checking the stop (brake) light
- Depress brake pedal.
Do the stop (brake) lamps light when the pedal is depressed.
Yes - Checking for an open-circuit in the cable
No - Checking fuse 11/12
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Checking for an open-circuit in the cable
Check cable between stop (brake) lamp switch connector terminal 2 and control module #12 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Select "Continue" when the fault has been repaired.
Continue - Verification
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Checking fuse 11/12
Check that fuse 11/12 is intact.
Is fuse 11/12 intact?
Yes - Checking voltage before fuse 11/12
No - Checking for a short-circuit and replacing component
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Checking for a short-circuit and replacing component
Check cable between control module #12 and fuse 11/12 and cable to stop (brake) lamp for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
On vehicles with automatic transmission: Check cable between stop (brake) lamp switch connector terminal 2 and automatic transmission control module (TCM) #B26 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Then replace the fuse.
Select "Continue" when the fault has been repaired.
Continue - Verification
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Checking voltage before fuse 11/12
- Ignition off.
Connect a voltmeter between the rear socket (windshield side) on the fuse holder for fuse 11/12 and ground.
The voltmeter should read battery voltage.
OK - Checking power supply to stop (brake) light switch
Not OK - Checking for an open-circuit in the cable
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Checking for an open-circuit in the cable
Check cable between fuse 11/12 and battery for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Select "Continue" when the fault has been repaired.
Continue - Verification
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Checking power supply to stop (brake) light switch
- Ignition off.
- Remove soundproofing.
Connect a voltmeter between stop (brake) lamp switch terminal 1 and ground.
The voltmeter should read approximately battery voltage.
OK - Checking the stop (brake) light switch
Not OK - Checking for an open-circuit in the cable
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Checking for an open-circuit in the cable
Check cable between stop (brake) lamp switch terminal 1 and fuse 11/12 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Select "Continue" when the fault has been repaired.
Continue - Verification
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Checking the stop (brake) light switch
- Ignition off.
Connect a voltmeter between stop (brake) lamp switch terminal 2 and ground.
- Depress brake pedal.
The voltmeter should read approximately battery voltage.
OK - Checking for an open-circuit in the cable
Not OK - Replacing component
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Checking for an open-circuit in the cable
Check cable between stop (brake) lamp switch connector terminal 2 and control module #12 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Select "Continue" when the fault has been repaired.
Continue - Verification
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Replacing component
Try a new stop (brake) lamp switch according to Replacing stop (brake) light switch later type Service and Repair.
Select "Continue" when the component has been replaced.
Continue - Verification
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Verification
Hint: After carrying out the repair check that the fault has been remedied.
- Ignition on.
- Go into scrolling values, list 3.
Read off stop (brake) lamp switch) position.
With the brake pedal up this value should be OFF. With the brake pedal depressed this value should be ON.
OK - FAULT FOUND
Not OK - Fault-tracing information
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Fault-tracing information
Information
Attempt New Test - Checking stop (brake) light status
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