Locks: Testing and Inspection
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Fault Tracing
1. Check the fuses. Check the voltage supply to control unit (175) pin 4. This pin should always be live.
2. Check that pin 7 of the control unit (175) is live when the door key is in the unlock position. Check that pin 8 of the control unit (175) is live when the key is in the unlock position.
CAUTION! The lock motors should only be tested through pin 7 and pin 8 of the control unit (175). Do not 'bench test' the lock motors using any other power supply sources as this may overload and damage the motors.
NOTE: When testing pin 7 and pin 8, the supply will only be live for approximately 1 second.