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Checking the ON/OFFfunction

Checking the ON/OFF function



Important

The following conditions must be fulfilled before activation of the ON/ OFF function in the Cruise Control system control module will be possible:

ON/OFF:

Pin A (1): approx. 12 V

Pin B (2): approx. 12 V

Pin C (3): approx. 12 V



1. Connect the BOB and check that about 12 V is present across pins A (1), B (2) and C (3) of the Cruise Control connector when ON/OFF is held in the depressed position.



Measure the voltage across the pins and a good ground.

2. If the voltage readings are not OK, check that 12 V is present across pin 7 of the switch connector and a good ground.

If the voltage is OK, continue with point 4.


3. If the voltage is not OK, check the wiring for continuity or a short circuit by measuring the resistance across the load side of the fuse and pin 7 of the switch connector.


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

4. Check the switch by holding it in the ON/OFF position and measuring the resistance across pins 7 and 8, across pins 7 and 9, and across pins 7 and 10.


If the resistance reading obtained during any measurement is > 1 ohm, fit a new switch.

5. If the resistance is > 1 ohm, check the wiring for continuity or a short circuit by measuring the resistance across:


• pin 10 of the switch connector and pin B of the Cruise Control connector.

• pin 9 of the switch connector and pin C of the Cruise Control connector.

• pin 8 of the switch connector and pin A of the Cruise Control connector. If the resistance is > 1 ohm, rectify the fault.

6. If it has not been possible to determine a fault using the above checks, continue fault diagnosis with .