Test TC-97A - No CCD Message From Body Control Module (BCM)
NOTE:
For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS
article.
- Using scan tool, clear Diagnostic Trouble Codes (DTCs) from Powertrain Control Module (PCM). Start engine and allow engine to idle for one minute.
- Using scan tool, check for stored DTCs. If scan tool displays NO CCD MESSAGE FROM BODY CONTROL MODULE, go to step 6. If scan tool does not display NO CCD MESSAGE FROM BODY CONTROL MODULE, go to next step.
- Conditions required to set DTC are not present at this time. The PCM and BCM communicate messages across the CCD bus, as information from either module is needed to operate their respective systems. DTC may be stored in PCM when no CCD bus messages are received from BCM for 30 seconds. Possible causes are: open circuit on CCD bus, BCM not powered up, defective BCM or defective PCM.
- Check for defective wiring or connections at PCM and BCM. The PCM is located between driver's side front fender and power distribution center, near battery. The BCM is located behind junction block, just to the left of brake pedal. See Fig 1.
- If wiring or connectors are damaged, repair as necessary. Perform TEST VER-2A - ROAD TEST VERIFICATION . If wiring and connectors are not damaged, see INACTIVE TROUBLE CODE CONDITION . Perform TEST VER-2A - ROAD TEST VERIFICATION .
- Ensure ignition is off. Disconnect connectors at PCM and BCM. The PCM is located between driver's side front fender and power distribution center, near battery. The BCM is located on behind junction block, just to the left of brake pedal. See Fig 1.
- Using ohmmeter, check resistance between PCM connector terminal No. 59 (Violet/Brown wire) and BCM connector "A" (Black connector) terminal No. 3 (Violet/Brown wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit in Violet/Brown wire between PCM and BCM. Perform TEST VER-2A - ROAD TEST VERIFICATION .
- Using ohmmeter, check resistance between PCM connector terminal No. 60 (White/Black wire) and BCM connector "A" (Black connector) terminal No. 34 (White/Black wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit in White/Black wire between PCM and BCM. Perform TEST VER-2A - ROAD TEST VERIFICATION .
- Reinstall connectors on BCM. Turn ignition on. Select BODY CONTROL MODULE on scan tool. If scan tool displays NO RESPONSE, replace BCM. Perform TEST VER-2A - ROAD TEST VERIFICATION . If scan tool does not display NO RESPONSE, replace PCM. Perform TEST VER-2A - ROAD TEST VERIFICATION .