• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Linear Interconnect Network Bus | U1500, U1511 | U1511 | U1500, U1511 | -- |
Battery Positive Voltage | U1511 | U1511 | -- | -- |
Ground (rear window motor) | -- | U1511 | -- | -- |
The remote compass module (RCM) communicates with the body control module (BCM) utilizing a single wire LIN communication link. The BCM is the gateway for the GMLAN network. All data is communicated on the LIN bus, therefore there are only 3 circuits to the module as follows:
• | Ground |
• | LIN bus |
• | Voltage |
The system voltage is between 9-16 volts.
• | The local interconnect network bus circuit has an open/high resistance, short to ground, or a short to voltage. |
• | The ignition voltage circuit of the RCM is open or shorted to ground. |
• | The ground circuit of the RCM is open. |
RCM will not operate
• | The current DTC will clear when the malfunction is no longer present. |
• | A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction. |
Control Module References for scan tool information
Verify that DTC B1433 is not set.
⇒ | If DTC is set, refer to DTC B1433 . |
⇒ | If greater than the specified range, test the circuit for an open/high resistance. |
⇒ | If the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal and the RCM fuse is open, replace the RCM |
⇒ | If greater than the specified range, test the LIN circuit for a short to voltage. If the circuit tests normal, replace the BCM. |
⇒ | If less than the specified range, test the LIN circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If greater than the specified range, test the circuit for an open/high resistance. |
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for BCM and RCM replacement, setup, and programming