Faulty Signal. Permanent Fault
Faulty signal. Permanent fault
Checking the status of the stop (brake) lamp
- Ignition on.
Check whether any of the stop (brake) lamps light even though the brake pedal is not depressed.
Do any of the stop (brake) lamp bulbs light?
Yes - Checking the adjustment of the stop (brake) lamp switch
No - Checking the signal cable
Connecting the breakout box
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Checking the adjustment of the stop (brake) lamp switch
- Expose the stop (brake) lamp switch.
Check if the stop (brake) lamp switch is adjusted so that it is activated even though the pedal is not depressed.
Is the switch activated?
Yes - Remedy the component
No - Checking the stop (brake) lamp switch
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Remedy the component
- The fault is because the stop (brake) lamp switch is permanently activated.
Adjust the stop (brake) lamp switch according to Stop lamp switch, adjustment Adjustments.
Select Continue when the fault has been remedied.
Continue - Verification
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Checking the stop (brake) lamp switch
- Expose the stop (brake) lamp switch, if this has not already been done.
Disconnect the stop (brake) lamp switch.
Do the stop (brake) lamps go out when the stop (brake) lamp switch is disconnected?
Yes - Replacing the component
No - Checking for a short-circuit
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Replacing the component
Try a new stop (brake) lamp switch according to Stop lamp switch, adjustment Adjustments.
Select Continue when the fault has been remedied.
Continue - Verification
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Checking for a short-circuit
Check the cable between control module terminal 14 and stop (brake) lamp switch terminal 2 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
The connection is via the central electrical module. The input signal is via terminal B1:3. The output signal is via terminal F1 to the control module.
Also check the cables between:
• ABS control module terminal 14
• DSA control module terminal 7
• Automatic transmission control module (TCM) terminal 5
• Cruise control control module terminal 7
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 remedied.
Continue - Verification
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Connecting the breakout box
Connecting the breakout box
951 1426 31-pin adapter 951 1426 31-Pin Adapter 981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428
Connecting the breakout box to the ABS control module
Is the breakout box connected to the ABS control module?
Yes - FAULT FOUND
No - Connecting the breakout box
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Connecting the breakout box
- Ignition off.
- Disconnect the ABS control module.
- Check the control module and the control module connector to ensure that:
The male and female terminals are undamaged and properly attached (cannot be pressed in).
The wiring for the female terminals are securely connected.
Check in particular those terminals that are relevant to the stored diagnostic trouble code (DTC) / symptoms.
Connect adapter 951 1426 31-pin adapter 951 1426 31-Pin Adapter to the control module connector (wiring side). Connect breakout box 981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 to the adapter.
Note! ABS control module terminals 1-40 correspond to terminals 1-40 on the breakout box.
Select Continue.
Continue - Checking the ground terminal
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Checking the ground terminal
- Ignition off.
- Switch of all power consuming components, such as the passenger compartment lighting and the radio.
Connect an ohmmeter between terminal 16 on the breakout box and the battery negative terminal.
The ohmmeter should read approximately 0 ohms.
OK - No Fault FoundFault-tracing information
Not OK - Checking for an open-circuit and contact resistance
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Checking for an open-circuit and contact resistance
Check ground terminal 31/2. Check the cable between ground terminal 31/2 and control module terminal 16 for:
an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
contact resistance according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Check the ground lead between the battery and the bodywork for:
an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
contact resistance according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Select "Continue" when the fault has been remedied.
Continue - Verification
Verification
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Verification
Verification
Verification
Hint: Check after repair that the fault has been rectified.
Proceed as follows:
- Switch off the ignition.
- Switch off all power consuming components such as the courtesy lighting and the radio.
- Connect an ohmmeter between terminal 16 on the breakout box and the battery negative terminal.
The ohmmeter should read approximately 0ohms.
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 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 - FAULT-TRACING FAILED
No - Attempt New Test
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Attempt New Test - Connecting the breakout box
FAULT-TRACING FAILED - FAULT-TRACING FAILED
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FAULT FOUND - Checking the signal cable
No Fault Found - Checking the signal cable
FAULT-TRACING FAILED - Checking the signal cable
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Checking the signal cable
- Ignition off
- Connect the control module again.
- Switch on the ignition.
Connect a voltmeter between terminals 1 and 14 on the breakout box.
The voltmeter should read approximately 0 V.
OK - Checking for an open-circuit
Not OK - Checking for an open-circuit
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Checking for an open-circuit
- The cause of the diagnostic trouble code (DTC) was loose connections in the control module connector.
Check the connector for contact resistance and oxidation. Remedy according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Select Continue when the fault has been remedied.
Continue - Verification
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Checking for an open-circuit
Check the cable between control module terminal 14 and one of the stop (brake) lamp bulbs for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Was the cable OK?
Yes - Checking for an open-circuit
No - Verification
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Checking for an open-circuit
Check the stop (brake) lamp bulbs. Check the stop (brake) lamp ground terminal. Check 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 remedied.
Continue - Verification
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Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied as follows.
- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Read off the status of the stop (brake) lamp switch.
When the brake pedal is unaffected, the value should be OFF. When the brake pedal is depressed the value should be ON.
OK - VERIFIED
Not OK - VERIFICATION FAILEDPAPER
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VERIFICATION FAILED - Fault-tracing information
VERIFIED - FAULT FOUND
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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 - FAULT-TRACING FAILED
No - Attempt New Test
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Attempt New Test - Checking the status of the stop (brake) lamp
FAULT-TRACING FAILED - FAULT-TRACING FAILED
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