Circuit/System Testing

Test for less than 1.0 ohm of resistance between the DLC ground circuit terminal 5 and ground.
- If greater than 1.0 ohm, test the ground circuit for open/high resistance.

IMPORTANT: Cycle the ignition Key OFF before each module disconnect and ON to attempt communication.

Ignition OFF, disconnect the module harness connectors listed one at a time, attempting to communicate with the BCM after each disconnect. Communication should not be available.
- Digital radio receiver - X1
- Vehicle communication interface module (VCIM) - X2
- Transfer case shift control module - X1
- Instrument panel cluster (IPC) - X1
- Radio - X1, X2
- Powertrain control module (PCM) -X1
- Inflatable restraint sensing and diagnostic module (SDM) - X1
- Electronic brake control module (EBCM) - X2
- If communications are available after a module disconnect, test all the serial data circuits to the last module disconnected for a short to ground or short to voltage. If the circuits test normal, replace the last module disconnected.
Ignition OFF, disconnect the BCM harness connector X1 and X2.
Verify a test lamp does not illuminate between B+ and the following BCM connector terminals. The test lamp should not illuminate.
- X2, terminal A38
- X2, terminal A39
- X2, terminal A44
- X1, terminal A41
- X1, terminal A42
- X1, terminal A47
- If the test lamp illuminates, test the serial data circuit for a short to ground.
Verify a test lamp does not illuminate between ground and the following BCM connector terminals. The test lamp should not illuminate.
- X2, terminal A38
- X2, terminal A39
- X2, terminal A44
- X1, terminal A41
- X1, terminal A42
- X1, terminal A47
- If the test lamp illuminates, test the serial data circuit for a short to voltage.
If the circuits test normal, replace the BCM.