For a complete wiring diagram Refer to Section 8W.Possible Causes(A116) FUSED B (+) (I.O.D.) CIRCUIT OPEN OR SHORTED(Z910) GROUND CIRCUIT OPEN(D264) AND (D265) CAN C INTERIOR BUS (125K) CIRCUITS OPENAMPLIFIER1. TEST FOR INTERMITTENT CONDITIONTurn the ignition on.Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.With the scan tool, select ECU View.A red X will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.Does the scan tool display a red X next to the module?YesGo To 2 NoThe no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.2. (A116) FUSED B(+) (I.O.D.) CIRCUIT OPEN OR SHORTED

Turn the ignition off.Disconnect the Radio Amplifier C1 harness connector.Using a 12-volt test light connected to ground, check the (A116) Fused B(+) (I.O.D.) circuit.Does the test light illuminate brightly?YesGo To 3NoRepair the (A116) Fused B(+) (I.O.D.) circuit for an open or short.Perform the BODY VERIFICATION TEST – VER 1.(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).3. (Z910) GROUND CIRCUIT OPEN

Using a 12-volt test light connected to 12-volts, check the (Z910) ground circuit.Does the test light illuminate brightly for each circuit?YesGo To 4NoRepair the (Z910) ground circuit for an open.Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).4. (D265) OR (D264) CAN C INTERIOR BUS (125K) CIRCUIT OPEN

Measure the resistance of the (D264) CAN C Interior Bus (-) (125K) circuit between the TIPM C7 harness connector and the Radio Amplifier C1 harness connector.Measure the resistance of the (D265) CAN C Interior Bus (+) (125K) circuit between the TIPM C7 harness connector and the Radio Amplifier C1 harness connector.Is resistance below 5.0 ohms on both circuits?YesReplace the Radio Amplifier in accordance with the service information.Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).NoRepair the (D265) or (D264) CAN C Interior Bus (125K) circuit for an open. Inspect the connector for damage.Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).