U1433-24

U1433-24-IMPLAUSIBLE IGNITION SWITCH STATUS MESSAGE RECEIVED - SIGNAL STUCK HIGH





For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The Body Control Module (BCM) monitors the hardwired ignition switch input circuit from the Radio Frequency (RF) Hub module and compares it to the ignition switch status message received over the Controller Area Network (CAN) bus.

- When Monitored:
With the ignition switch on.

- Set Condition:
The BCM detects that the CAN bus message transitions between ignition off and ignition on, but the hardwired ignition switch input voltage from the RF Hub module did not change states.





1. CHECK FOR ACTIVE DTC

NOTE: Check to make sure the battery and charging system are operating properly. Battery and/or charging system problems may cause these DTCs to set.

NOTE: Diagnose any related Powertrain DTC(s) before continuing.

1. Turn the ignition on.
2. With the scan tool, read DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 2

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK THE (F20) IGNITION RUN-START OUTPUT CIRCUIT FOR A SHORT TO BATTERY VOLTAGE




1. Turn the ignition off.
2. Disconnect the BCM E harness connector.
3. Disconnect the RF Hub Module C1 harness connector.
4. Turn the ignition on.
5. Measure the voltage between ground and the (F20) Ignition Run-Start Output circuit.

Is there any voltage present?

Yes

- Repair the short to voltage in the (F20) Ignition Run-Start Output circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. CHECK THE RF HUB MODULE FOR AN INTERNAL SHORT TO VOLTAGE




1. Turn the ignition off.
2. Reconnect the RF Hub Module C1 harness connector.
3. Measure the voltage between ground and the (F20) Ignition Run-Start Output circuit.

Is there any voltage present?

Yes

- Replace the RF Hub Module. Radio Frequency Module (RF Hub) - Removal.
- Perform the RADIO FREQUENCY HUB (RF HUB) VERIFICATION TEST. RF Hub Verification Test

No

- Replace the BCM. Body Control Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.