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Checking the brake lights switch (notTCS)

Checking the brake lights switch (not TCS)


In order for the Cruise Control system to work, at least one of the brake light bulbs must be OK.

This means than pin G (7) of the Cruise Control connector must be grounded (through the brake light bulbs) before the Cruise Control system can be activated.


1. Check that the brake light bulbs are OK.

If they are not, change them.

2. If the brake light bulbs are not OK, continue fault diagnosis as described in the section headed "ICE" in Service Manual 3:5 "Electrical system, instruments".

If the bulbs are OK, check the operation of the Cruise Control system.

3. If the Cruise Control system still does not work, check that about 12 V is present across pin G (7) of the Cruise Control connector and a good ground when the brake pedal is depressed.




If voltage is OK, continue fault diagnosis with .

4. If the voltage is not OK, check the wiring for continuity or a short circuit by measuring the resistance across pin 1 of the brake lights switch and pin G (7) of the Cruise Control.


If the resistance is > 1 ohm, rectify the fault.

If the resistance is > 1 ohm, continue fault diagnosis as described in the section headed "ICE" in Service Manual 3:5 "Electrical system, instruments".