Control Assembly: Testing and Inspection

The control switch and timer circuit may be tested in the vehicle with or without scan tool (DRB).

Testing With Scan Tool
- For testing of the Heating and Air Conditioning Control System, refer to Body Control Module, Testing and Inspection.

Testing Without Scan Tool

HVAC Control Module Connector:

Control Module Test:

1. Remove the control switch from console and disconnect control switch.
2. Using a ohmmeter, check leads between Pins 5 and 8 of the 8-Way connector. Turn the control module to each position shown on Control Module Test table. The resistance reading should be within the specifications shown. If not OK, replace the control module. If OK, check:
- Blown fuse
- Cut wire
- Poor ground
- Poor connection
- Defective BCM
- Bulkhead connector inoperative