Diagnostic Test
- READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR DTC TO RETURN
- With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
- With the scan tool, run a vehicle Scan Report, or record the Environmental Data related to the DTCs.
- With the scan tool, perform an ECU reset to the Radio and AMP (if equipped), and then erase DTCs.
- Turn the ignition off for a minimum of 10.0 seconds.
- Turn the ignition on.
- Using the recorded Environmental Data and the When Monitored Conditions above, operate the vehicle in the conditions that set the DTC.
- With the scan tool, read DTCs.NOTE:
The Radio must be on and a front door must remain open whenever checking or erasing Radio DTCs.
Did the DTC return?
Yes
- Go To Next Step.
No
- Perform the appropriate INTERMITTENT CONDITION diagnostic procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
- CHECK THE CABIN EQUALIZATION CURVE NUMBER
- With the scan tool in the BCM ECU Details Tab, Configuration button, record the Cabin Equalization Curve number.
- With the scan tool in the Radio ECU Details Tab, Configuration button, record the True value.NOTE:
The Cabin EQ Curve value found in the BCM should match the True value found in the Radio.
Do the Cabin EQ settings match one another?
Yes
- Replace the Radio in accordance to the Service Information. Refer to RADIO, REMOVAL AND INSTALLATION .
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
No
- Go To Next Step.
- VERIFY COMMUNICATION WITH BCM
- With the scan tool, read the active modules on the BUS.
Does the scan tool show the BCM active on the BUS?
Yes
- Go To Next Step.
No
- Perform the No Response From ECU diagnostic procedure. Refer to NO RESPONSE FROM ECU .
- With the scan tool, read the active modules on the BUS.
- CHECK THE BCM FOR ACTIVE DTCs
- With the scan tool, perform an ECU reset to the Radio and BCM, and then erase DTCs.
- Turn the ignition off for a minimum of 10.0 seconds.
- Turn the ignition on.
- With the scan tool, read BCM DTCs and record them on the repair order.
Are any active DTCs present?
Yes
- Perform the appropriate diagnostic procedure. Refer to BODY CONTROL MODULE (BCM), DIAGNOSTIC CODE INDEX .
No
- Replace the Body Control Module (BCM) in accordance with the Service Information. Refer to MODULE, BODY CONTROL (BCM), REMOVAL AND INSTALLATION .
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .