No Communication With SDARS - Radio

NO COMMUNICATION WITH SDARS - RADIO

For a complete wiring diagram Consult Diagrams/Electrical





Diagnostic Test

1. SDARS WIRING HARNESS
Turn the ignition off.
Disconnect the Radio C2 harness connector.
Disconnect the Satellite Radio Receiver Module harness connector.
Visually inspect the connectors for damage.
Check for open circuits in the wiring harness between the Radio and the Satellite Radio Receiver.
Measure the resistance of the each circuit between the Radio C2 connector and the Satellite Radio Receiver connector.
Check for shorted circuits in the wiring harness between the Radio and the Satellite Radio Receiver.
Measure the resistance between each circuit at the Radio C2 connector.

NOTE: If vehicle is equipped with a satellite radio multiplexer, check connectors. This device is a pass through for the satellite radio receiver circuits.

Are any of the circuits shorted together or open?

Yes

- Replace/repair the SDARS wiring harness.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test

No

- Go To2

2. PCI BUS CIRCUIT OPEN TEST
Use Scope input cable CH7058, Cable to Probe adapter CH7062, and the red and black test probes.
Connect the scope input cable to the channel one connector on the scan tool. Attach the red and black leads and the cable to probe adapter to the scope input cable.
With the scan tool select Pep Module Tools.
Select lab scope.
Select Live Data.
Select 12 volt square wave.
Press F2 for Scope.
Press F2 and use the down arrow to set voltage range to 20 volts. Press F2 again when complete.
Disconnect the Satellite Radio Receiver harness connector.

NOTE: If vehicle is equipped with a satellite radio multiplexer, check connectors. This device is a pass through for the satellite radio receiver circuits.

Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus circuit in the Satellite Radio Receiver connector.
Reconnect the Radio C2 harness connector.
Turn the ignition on.
Turn the Radio and place the radio in the Satellite mode.
Observe the voltage.
Does the voltage pulse from 0 to approximately 7.5 volts?

Yes

- Go To3

No

- Replace the Radio.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test

3. IGNITION RUN/ACC SIGNAL CIRCUIT OPEN
Turn the ignition off.
Disconnect the Satellite Radio Receiver harness connector.

NOTE: If vehicle is equipped with a satellite radio multiplexer, check connectors. This device is a pass through for the satellite radio receiver circuits.

Turn the ignition on.
Turn the Radio and place the radio in the Satellite mode.
Using a 12-volt test light connected to ground, probe the Ignition RUN/ACC Signal circuit.
Is the test light illuminated?

Yes

- Go To4

No

- Replace the Radio.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test

4. GROUND CIRCUIT OPEN
Turn the ignition off.
Disconnect the Satellite Radio Receiver harness connector.

NOTE: If vehicle is equipped with a satellite radio multiplexer, check connectors. This device is a pass through for the satellite radio receiver circuits.

Using a 12-volt test light connected to 12-volts, probe the ground circuit.
Is the test light illuminated?

Yes

- Replace the Satellite Radio Receiver
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test

No

- Repair the ground circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test