Diagnostic Test

CHECK FOR POWERTRAIN CONTROL MODULE (PCM) DTCS
NOTE:
Make sure the Battery and Generator Drive Belt are in good condition.

NOTE:
Inspect the vehicle for aftermarket accessories that may exceed the Generator System output.

NOTE:
Inspect the fuses in the Power Distribution Center (PDC). If an open fuse is found, use the wire diagram/schematic as a guide, inspect the wiring and connectors for damage.
1. With the scan tool, read PCM DTCs and record on the repair order.
  Are there any Battery or Charging System DTCs?
  
  Yes
  - Go to DTC INDEX and perform the appropriate diagnostic procedure. .
  No
  - Go To 2
CHECK FOR AN ACTIVE DTC
1. Turn the ignition to the Run position.
2. With the scan tool, read the Body Control Module (BCM) DTCs and record on the repair order.
  Is the DTC active?
  
  Yes
  - Go To 3
  No
  - The condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension. If no problems are found, test complete.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (A903) AND (A904) FUSED B(+) CIRCUITS FOR HIGH RESISTANCE
NOTE:
The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
1. Turn the ignition off.
2. Disconnect the BCM C2/B and C3/ C harness connectors.
3. Turn the ignition to the Run position.
4. Using a 12-volt test light connected to ground, check the (A903) Fused B(+) circuit at the BCM C3/ C harness connector.
5. Using a 12-volt test light connected to ground, check the (A904) Fused B(+) circuit at the BCM C2/B harness connector.
  Does the test light illuminate brightly for both circuits?
  
  Yes
  - Replace the Body Control Module (BCM) in accordance with the Service Information. Refer to MODULE, BODY CONTROL (BCM), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Repair the high resistance in the (A903) or (A904) Fused B(+) circuits.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .