U1096 Loss of IPC Serial Data Communication - HVAC

CIRCUIT DESCRIPTION
DTC U1096 will set if the ignition is ON and the Air Conditioning Programmer (ACM) or Climate Control Panel (CCP) has lost data communication with the Instrument Panel Cluster (IPC). This DTC should be seen only as a "History" DTC (if communications are currently inoperative the ACM or CCP will not he able to communicate with the IPC to display the DTC).

Diagnosis of this DTC is dependent upon other system symptoms (DTC) present with U1096.

TEST CONDITION(S)
1. Ignition in ON.

FAILURE CONDITION(S)
1. Open circuit.

ACTION TAKEN
1. Set DTC U1096

TROUBLESHOOTING HINTS
1. Using a scan tool attempt to establish communications with IPC .
2. Check CKT 1807 for an open or short to power or ground.
3. Check that the IPC is connected to power and ground.
4. IPC DTC U1152, loss of ACM serial data communications, or IPC DTC U1153, loss of CCP serial data communications, may he present with this DTC. If so, this would indicate that both the PZM and the ACM or CCP were functional when the DTC set, but they could not communicate with one another.
5. If there are multiple Class 2 DTCs current, check for a short to ground or voltage in CKT 1807.