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Door Lock Switch Short To Ground

Monitored & Set Condition

  1. When Monitored: With ignition On.
  2. Set Condition: When the BCM detects a voltage of less than .25-volts on the Door Lock Switch MUX input for over 5 seconds, this code will set. The normal voltage on the circuit is between .25 and 4.75-volts depending on switch positions.

Possible Causes:

Testing

  1. Turn the ignition on. With the DRBIII(R), erase DTC's. Operate the door locks several times. With the DRBIII(R), read DTCs. Does the DRBIII(R) display DRIVER DOOR LOCK SWITCH SHORT TO GROUND? If yes, go to next step. If no, problem is intermittent and not present at this time. Inspect the wiring and connectors and repair as necessary. Perform BODY VERIFICATION TEST  .
  2. Disconnect the Junction Block C2 connector. Measure the resistance between ground and the Door Lock Switch MUX circuit cavity 14 in the C2 connector. Is the resistance below 100 ohms? If yes, go to next step. If no, go to step  4 .
  3. Disconnect the Junction Block C2 connector. Disconnect the Left Door Lock Switch connector. Measure the resistance between ground and the Door Lock Switch MUX circuit cavity 14 in the C2 connector. Is the resistance below 100 ohms? If yes, repair the Door Lock Switch MUX wire for a short to ground. Perform BODY VERIFICATION TEST  . If no, replace the Left Door Lock Switch. Perform BODY VERIFICATION TEST  .
  4. Disconnect the Junction Block C2 connector. Measure the resistance between ground and the Door Lock Switch MUX circuit cavity 10 in the C2 connector. Is the resistance below 100 ohms? If yes, go to next step. If no, go to step  6 .
  5. Disconnect the Junction Block C2 connector. Disconnect the Right Door Lock Switch connector. Measure the resistance between ground and the Door Lock Switch MUX circuit cavity 10 in the C2 connector. Is the resistance below 100 ohms? If yes, repair the Door Lock Switch MUX wire for a short to ground. Perform BODY VERIFICATION TEST  . If no, replace the Right Door Lock Switch. Perform BODY VERIFICATION TEST  .
  6. Disconnect the Junction Block C2 connector. Remove the Body Control Module from the Junction Block. Measure the resistance between ground and the Door Lock Switch MUX circuit cavity 23 in the Junction Block Body Control Module connector. Is the resistance below 100 ohms? If yes, replace the Junction Block. Perform BODY VERIFICATION TEST  . If no, replace the Body Control Module. Perform BODY VERIFICATION TEST  .
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