Part 5

Checking disengagement cause (Continued)

Checking 30-supply to fuse




- Ignition on.
Connect a voltmeter between the rear socket of 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

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Checking for an open-circuit




- Ignition off.




- Check the cable between battery positive terminal and fuse 11/12 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 power supply to stop (brake) light switch








- Ignition off.
- Disconnect stop (brake) light switch.
- Ignition on.
Connect a voltmeter between stop (brake) light switch connector terminal 1 and ground.









The voltmeter should read battery voltage.

OK - Checking the stop (brake) light switch

Not OK - Checking for an open-circuit

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Checking for an open-circuit




- Ignition off.




- Check cable between fuse 11/12 and stop (brake) light switch connector terminal 1 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 stop (brake) light switch








- Ignition off.
- Connect stop (brake) light switch.
- Ignition on.
Connect a voltmeter between stop (brake) light switch connector terminal 2 and ground.









Voltmeter should read battery voltage when the brake pedal is depressed more than 5-10 mm.

OK - Checking the stop (brake) light bulbs

Not OK - Adjusting the stop (brake) light switch

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Replacing component




- Ignition off.
- Try a new control module according to Replacing control module Service and Repair.





Continue - Verification

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Checking the stop (brake) light bulbs








- Ignition off.
- Check that stop (brake) light bulbs are intact. Replace if necessary.
- Disconnect stop (brake) light switch.
Connect an ohmmeter between stop (brake) light switch connector terminal 2 and ground.









The ohmmeter should read approx. 0 ohms.

OK - Checking response code

Not OK - Checking for an open-circuit

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Checking for an open-circuit




- Ignition off.








- Check cable between stop (brake) light switch connector terminal 2 and stop (brake) light bulbs for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. If no fault is found replace the bulb failure warning sensor.





Continue - Verification

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Checking response code








- Ignition off.
- Connect stop (brake) light switch.
- Ignition on.




- Activate Diagnostic Test Mode (DTM) 2.
- ON/OFF switch to the OFF position
- Depress brake pedal.
- Check whether response code 1-3-2 is returned.





Response code 1-3-2 returned?

Yes - FAULT FOUND

No - Replacing component

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Replacing component




- Ignition off.
- Replace bulb failure warning sensor.

Continue - Verification

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Checking power supply to control module












- Ignition off.
- Stop (brake) light switch connected.
- Brake pedal up.
- Disconnect control module.
- Ignition on.
Connect a voltmeter between control module connector terminal 6S and ground.









The voltmeter should read approx. 0 V.

OK - Checking signal cable resistance

Not OK - Checking for a short-circuit

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Checking for a short-circuit




- Ignition off.








- Check cable between stop (brake) light switch connector terminal 2 and control module connector terminal 6S for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.





Continue - Verification

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Checking signal cable resistance












- Ignition off.
- Control module disconnected.
- Disconnect stop (brake) light switch.
Connect an ohmmeter between stop (brake) light switch connector terminal 2 and control module connector terminal 6S.









The ohmmeter should read approx. 0 ohms.

OK - Checking control module connector

Not OK - Checking for an open-circuit

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