Checking the Tip Function

Conditions for TIP
The following conditions must be fulfilled before activation of the TIP function in the Cruise Control system control module will be possible:
Pin A (1): 0 V
Pin B (2): 12 V
Pin C (3): 12 V

1 Connect the BOB and check that a 12 V supply is present across connection B of the Cruise Control and a good ground, and also across connection C of the Cruise Control and a good ground. Also check that there is no voltage (0 V) across connection A and a good ground when the TIP button is held in the depressed position.





2 If the voltage readings are not correct, check whether a 12 V supply is present across connection 7 of the switch 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, remedy the fault
4 Check the switch by keeping it in the TIP position and measuring the resistance across pins 7 and 9 and also across pins 7 and 10.
Hold the switch in the ON/OFF position and measure the resistance across pins 7 and 8.
If the resistance obtained during any measurement is > 1 ohm, install 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, check the wiring and rectify the fault.
6 If no fault has been detected in the above checks, continue fault diagnosis in "Before control module replacement".