Diagnostic Test
- CHECK FOR AN ACTIVE DTC
- Turn the ignition on, then off, and then on again.
- With the scan tool, read the Radio DTCs and record them on the repair order.
Is the DTC active?
Yes
- Go To 2
No
- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
- CHECK THE BATTERY VOLTAGE TO THE RADIO WITH THE SCAN TOOL
- With the scan tool in Data Display, read the Radio battery voltage.
Is the battery voltage less than 9.0 volts?
Yes
- Go To 3
No
- Replace the Radio in accordance with the Service Information.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
- With the scan tool in Data Display, read the Radio battery voltage.
- CHECK THE BATTERY VOLTAGE TO THE RADIO
- Disconnect the Radio C1 harness connector.NOTE:
Check the Radio harness connector for signs of corrosion, pushed out or bent terminals, and correct pin tension.
- Measure the voltage between ground and the (A933) Fused B+ circuit at the Radio C1 harness connector.
Is the battery voltage less than 9.0 volts?
Yes
- Go To 4
No
- Replace the Radio in accordance with the Service Information.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
- Disconnect the Radio C1 harness connector.
- CHECK FOR CHARGING SYSTEM RELATED DTCS IN THE POWERTRAIN CONTROL MODULE (PCM)
- With the scan tool in ECU View, select PCM and check for any Charging System related DTCs.
Does the scan tool display any Charging System related DTCs?
Yes
- Refer to DTC INDEX and perform the appropriate charging system or battery DTC diagnostic procedure.
No
- Check for voltage drop concerns across the (A933) Fused B+ circuit and repair as needed.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
- With the scan tool in ECU View, select PCM and check for any Charging System related DTCs.