Possible Causes
| Possible Causes |
|---|
| DEALER INSTALLED EQUIPMENT |
| ECU POWER SUPPLY (FUSED B+/IGNITION) RELATED CIRCUIT(S) OPEN CIRCUIT, SHORTED TO GROUND OR ANOTHER CIRCUIT |
| ECU GROUND CIRCUIT(S) OPEN/HIGH RESISTANCE |
| ECU LIN BUS CIRCUIT (+/-) OPEN/HIGH RESISTANCE, SHORTED TO GROUND, VOLTAGE, OR ANOTHER CIRCUIT |
| SLAVE MODULE |
| MASTER MODULE |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to HVAC PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .