Cars With Automatic Transmission

1 Connect the BOB and check that a 12 V supply is present across pin D (4) of the Cruise Control connector and a good ground (selector lever in position D, 1, 2, 3).
There should be zero voltage (0 V) when the selector lever is in position P, R or N.
2 It the voltage reading is not correct, check whether a 12 V supply is present on connection 2 of the brake pedal switch when the selector lever is in position D, 1, 2 or 3 and 0 V when it is position P, R or N.
If the voltage is OK, continue with point 5.





3 If the voltage is not OK, check whether a 12 V supply is present on connection 4 of the selector lever's 7-pin connector.
If the voltage is OK, continue with point 4.
If the voltage is not OK, measure the resistance across the load side of the fuse and pin 4 of the selector lever's 7-pin connector.
If the resistance is > 1 ohm, check the wiring and remedy the fault.
4 Check the wiring for continuity or a short circuit by measuring the resistance across pin 3 of the selector lever's 4-pin connector and connection 2 of the brake pedal switch.
If the resistance is <=1 ohm, the fault is in the selector lever.
Check or adjust the selector lever.
If the resistance is > 1 ohm, check the wiring and remedy the fault.





5 Measure the resistance across pins 1 and 2 of the brake pedal switch when the pedal is depressed and also when it is not depressed.
If the resistance with the pedal in the normal position (not depressed) is > 1 ohm, adjust the pedal switch or perhaps install a new one.
Depressing the pedal breaks the circuit. If resistance can be measured in the circuit, change the pedal switch.
6 If the pedal switch is OK, check the wiring for continuity or a short circuit by measuring the resistance across pin 1 of the brake pedal connector and pin D (4) of the Cruise Control connector.
The resistance should be <=1 ohm.