No Communication With DDM (ATC)

NO COMMUNICATION WITH DDM (ATC)

For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
With the ignition on.

- Set Condition:
If the A/C Heater Control fails to receive any messages from the Driver Door Module (DDM) for more than 5 seconds.





Diagnostic Test

1. VERIFY DTC IS ACTIVE
Turn the ignition on.
With the scan tool, read HVAC DTCs.
Does the scan tool display this DTC as active?

Yes

- Go To 2

No

- The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

2. VERIFY DDM IS ACTIVE ON THE BUS
With the scan tool, verify that the DDM is active on the Bus.
Is the DDM active on the Bus?

Yes

- Go To 3

No

- Communications - Verbose Codes for No Response related diagnostic procedures.

3. CHECK FOR DDM DTCs
With the scan tool, read DDM DTCs.
Does the scan tool display any DTCs?

Yes

- Diagnose and repair the DTC(s).

No

- Go To 4

4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCs
With the scan tool, select Network View and select Advanced.
Is there more than one module with active DTCs "Logged Against" the DDM?

Yes

- Using the schematics as a guide, check the DDM pins, terminals, and connectors for corrosion, damage, and terminal push out. Pay particular attention to all Communication, Power, and Ground circuits. If no problems are found, replace the DDM.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Using the schematics as a guide, check the A/C Heater Control pins, terminals, and connectors for corrosion, damage, and terminal push out. Pay particular attention to all Communication, Power, and Ground circuits. If no problems are found, replace the A/C Heater Control.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.