B1467

Main motors, shorting to ground, open circuit

Fault Symptom

The hood cannot be correctly operated.

Condition

Open circuit or shorting to ground on pin 1 (k20) or pin 11 (K20).

Diagnostic Procedure





1 Connect an ISAT scan tool and read "MAIN MOTOR". Operate the hood by means of the "ROOF" switch. The scan tool should show the state of the motor during operation of the hood. If the ISAT scan tool readings are OK, use the scan tool command "DTC DATA" to obtain the value the main potentiometer had when the fault occurred. Try to repeat the fault using this information and check that the hood can move freely without obstruction. If hood operation is OK, clear the trouble code and check that it is not generated afresh.

2 If one of the two motors is in working order, there is an open circuit in the defective motor's wiring. Unplug the connector from the defective motor and take a voltage reading across pin 1 of the connector and a good ground and across pin 2 of the connector and a good ground. Activate the motor at the same time by means of the ISAT scan tool or the "ROOF" switch. A reading of 12v should be obtained on pin 1 (K20) of the control module connector when activated up and on pin 11 (K20) when activated down. If a reading of 12v is obtained on the voltmeter, there is an open circuit between the motor and its connector. Check the wiring between the motor and the connector for continuity. Rectify any faults. If the wiring is OK, change the motor.

3 If a reading of 12v cannot be obtained in the connector, there is an open circuit between the motor connector's and the emergency hood raising handle's connector. Check the wiring for continuity.





4 If neither of the motors is in working order, unplug connector H6-4 and take a voltage reading across pin 1 of connector H6-4 and a good ground. Operate the main motors down by means of the ISAT scan tool or the "ROOF" switch and check that a reading of 12v is obtained.

5 If a correct voltage reading cannot be obtained, check the wiring harness between pin 11 (K20) and pin 1 in H6-4 for continuity/shorting to ground.

6 If the voltage reading obtained on H6-4 is OK, check the operation of the emergency hood-raising handle switch. Take a resistance reading across pins 1 and 3 and across pins 1 and 2. If in proper working order, a resistance reading of less than 1 ohm should be obtained.





7 Also check the wiring harness between the two motors and pin 1 (k20) of the TSAS control module and between the two motors and H6-4 for continuity/shorting to ground.