Inspection and Verification
- Verify the customer concern.
- Visually inspect for obvious signs of electrical damage.
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
VISUAL INSPECTION CHARTElectrical - Battery Junction Box (BJB) fuse(s):
- 5 (10A) (no communication with ABS module, PCM or TCM (hybrid))
- 8 (5A) (no communication with BCM-HVTB (hybrid))
- 9 (50A) (no communication with ABS module)
- 15 (50A) (no communication with BCM-HVTB (hybrid))
- 18 (20A) (no communication with ABS module (Except Hybrid))
- 18 (50A) (no communication with ABS module (hybrid))
- 23 (15A) (no communication with PCM)
- 24 (10A) (no communication with TCM (hybrid))
- 25 (5A) (no communication with ABS module (Except Hybrid), BCM-HVTB (hybrid))
- 26 (20A) (no communication with BCM-HVTB (hybrid))
- 27 (10A) (no communication with ABS module (hybrid), ACCM (hybrid))
- 29 (15A) (no communication with PCM)
- Smart Junction Box (SJB) fuse(s):
- 3 (15A) (no communication with APIM)
- 5 (10A) (no communication with the SJB)
- 11 (10A) (no communication with 4X4 control module)
- 14 (10A) (no communication with FCIM, FDIM, GPSM)
- 15 (10A) (no communication with HVAC module)
- 20 (15A) (no power to scan tool)
- 26 (10A) (no communication with IC)
- 27 (20A) (no communication with PCM)
- 29 (5A) (no communication with IC)
- 31 (10A) (no communication with RCM)
- 35 (10A) (no communication with PAM, 4X4 control module, PSCM)
- 37 (10A) (no communication with HVAC module)
- 39 (20A) (no communication with ACM)
- 46 (7.5A) (no communication with the OCSM)
- DLC
- Wiring, terminals or connectors
- Connect the scan tool to the Data Link Connector (DLC).
- If the Integrated Diagnostic System (IDS) does not communicate with the VCM:
- Check the VCM connection to the vehicle.
- Check the scan tool connection to the VCM.
- GO to PINPOINT TEST W , to diagnose No Power To The Scan Tool.
NOTE: Make sure to use the latest scan tool software release.NOTE: The Vehicle Communication Module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM. - If the Integrated Diagnostic System (IDS) does not communicate with the VCM:
- Establish a scan tool session.
- If an IDS session cannot be established with the vehicle, (IDS may state "No communication can be established with the PCM"):
- Choose "NO" when the scan tool prompts whether or not to retry communication.
- Enter either a PCM part number, tear tag or calibration number to identify the vehicle and start a session (the PCM part number and 4-character tear tag are printed on the PCM label).
- GO to PINPOINT TEST A to diagnose the PCM Does Not Respond To The Scan Tool.
NOTE: The scan tool first attempts to communicate with the PCM, after establishing communication with the PCM, the scan tool then attempts to communicate with all other modules on the vehicle. - If an IDS session cannot be established with the vehicle, (IDS may state "No communication can be established with the PCM"):
- Carry out the network test.
- If the network test passes, retrieve and record the continuous memory DTCs and proceed to Step 6.
- If the network test fails, GO to SYMPTOM CHART to diagnose the failed communication network.
- If a module fails to communication during the network test, GO to SYMPTOM CHART .
- Retrieve and review the DTCs.
- If the DTCs retrieved are related to the concern, go to DTC CHARTS . Follow the non-network DTC diagnostics (B-codes, C-codes, P-codes) prior to the network DTC diagnostics (U-codes). For all other DTCs, refer to the Diagnostic Trouble Code (DTC) Chart in MULTIFUNCTION ELECTRONIC MODULES article.
- If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART .