Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

TEST FOR INTERMITTENT CONDITION
NOTE:
Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.
1. Turn the ignition on.
  NOTE:
  Make sure the battery voltage is between 10.0 and 16.0 volts.
2. With the scan tool, read the module status.
  NOTE:
  Check the BCM for any active CAN hardware DTCs, perform DTC before proceeding. Refer to the DTC INDEX article.
  
  Does the scan tool indicate that the module is active on the bus?
  
  Yes
  - The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 2
CHECK THE (A988) FUSED B(+) CIRCUIT FOR AN OPEN OR SHORT
1. Turn the ignition off.
2. Disconnect the ESM C1 harness connector.
3. Using a 12-volt test light connected to ground, check the (A988) Fused B(+) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 3
  No
  - Repair the open or short in the (A988) Fused B(+) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (Z610) GROUND CIRCUITS FOR AN OPEN
1. Using a 12-volt test light connected to 12 volts, check the (Z610) Ground circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4
  No
  - Repair the (Z610) Ground circuit for an open or high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (F920) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT FOR AN OPEN OR SHORT
1. Turn the ignition on.
2. Using a 12-volt test light connected to ground, check the (F920) Fused Ignition Switch Output (Run-Start) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 5
  No
  - Repair the open or short in the (F920) Fused Ignition Switch Output (Run-Start) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (D465) AND (D464) CAN C BUS CIRCUITS FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the BCM C3 harness connector.
3. Measure the resistance of the (D465) CAN C Bus (+) circuit between the ESM C1 harness connector and the ESP C2 harness connector.
4. Measure the resistance of the (D464) CAN C Bus (-) circuit between the ESM C1 harness connector and the ESP C2 harness connector.
  Are the resistances below 5.0 Ohms?
  
  Yes
  - Replace the ESM in accordance with the service information. Refer to MODULE, ELECTRONIC SHIFTER (ESM), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair the (D465) or (D464) CAN C Bus circuit for an open or high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .