B1348

Diagnostic Trouble Code Chart (Part 1 Of 2):

Diagnostic Trouble Code Chart (Part 2 Of 2):

Wiring Schematic:

CIRCUIT DESCRIPTION
In the process of controlling the compressor clutch, the heater and A/C programmer monitors certain system inputs for an indication of a low refrigerant charge. The heater and A/C programmer monitors the normally closed low refrigerant pressure switch at pin D14. Inspect the status of the low pressure switch prior to the compressor engagement. If the switch opens, the following actions occur:
^ The heater and A/C programmer sets DTC B1348.
^ The message VERY LOW REFRIGERANT-A/C COMPRESSOR OFF is displayed on the driver information center (DIC).

If a DTC B1348 is set, the compressor clutch disengages and remains disengaged until DTC B1348 is cleared.

FAILURE CONDITIONS
^ The low refrigerant switch remains open for several minutes.
^ The vehicle must be traveling above 48 km/h (30 mph) for at least 30 seconds. This code may never set at idle or in city traffic.

ACTION TAKEN WHEN THE DTC SETS
^ The system disables the compressor until the DTC is cleared.
^ The system disables the VERY LOW REFRIGERANT-A/C COMPRESSOR OFF message on the DIC.

TEST DESCRIPTION
1. Perform the Diagnostic System Check before continuing with the diagnosis of this DTC.
2. This test inspects the current state of the low pressure switch.
3. This test inspects the circuits to the low pressure switch.
4. This test inspects for a restriction in the refrigerant system.
12. This test inspects the HVAC refrigerant system pressure.