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Checking the RESUME function

Checking the RESUME function





Important

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

Pin A (1): 0 V

Pin B (2): 0 V

Pin C (3): approx. 12 V



1. Connect the BOB and check that about 12 V is present across terminal C (3) of the Cruise Control connector and a good ground. Also check that no voltage (0 V) is present across terminals A (1) and B (2) and a good ground when the RESUME button is held in the depressed position.



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 RESUME position and measuring the resistance across pins 7 and 9.


Hold the switch in the ON/OFF position and measure the resistance across pins 8 and 9 and also 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 (2) of the Cruise Control connector.

• pin 9 of the switch connector and pin C (3) of the Cruise Control connector.

• pin 8 of the switch connector and pin A (1) 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 .