Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Ignition ON, command the appropriate actuator in both directions with a scan tool. The scan tool door position parameter reading should be between
3 and 253 counts.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate actuator.
2. Test for less than 1 ohm between the low reference circuit terminal 7 and ground.
锟斤拷 If greater than the specified range, test the low reference circuit for an open/high resistance.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 10 and ground.
锟斤拷 If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance.
锟斤拷 If greater than the specified range, test the 5-volt reference circuit for a short to voltage.
4. Verify the appropriate scan tool parameter is less than 4 counts.
锟斤拷 If greater than the specified range, test the signal circuit terminal 9 for a short to ground. If the circuit tests normal, replace the HVAC
control module.
5. Install a 3-amp fused jumper wire between the signal circuit terminal 9 and the low reference circuit terminal. Verify the appropriate scan tool
parameter is greater than 250 counts.
锟斤拷 If less than the specified range, test the signal circuit for a short to voltage or an open/high resistance.
6. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground.
锟斤拷 If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
7. Install a DMM between the actuator control circuit terminal 6 and ground. While monitoring the DMM, use the scan tool to command the
appropriate actuator from one direction to the other. The voltage on the control circuit should move from 0 volts in one direction to 5 volts in
the other direction and 2.5 volts in the at rest state.
锟斤拷 If the voltage does not change, test the control circuit for an open, short to voltage or short to ground. If circuit tests normal replace the
HVAC control module.
8. If all circuits test normal, replace the actuator.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Mode Valve Actuator Replacement (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Mode Valve Actuator Replacement)
* Temperature Valve Actuator Replacement - Left Side (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and
Repair/HVAC - Automatic/Temperature Valve Actuator Replacement - Left Side)
* Temperature Valve Actuator Replacement - Right Side (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and
Repair/HVAC - Automatic/Temperature Valve Actuator Replacement - Right Side)
* Auxiliary Temperature Valve Actuator Replacement (Behr) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service
and Repair/HVAC - Automatic/Auxiliary Temperature Valve Actuator Replacement (Behr))Auxiliary Temperature Valve Actuator
Replacement (Delphi) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Auxiliary Temperature Valve Actuator Replacement (Delphi))
* Auxiliary Mode Valve Actuator Replacement (Behr) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and
Repair/HVAC - Automatic/Auxiliary Mode Valve Actuator Replacement (Behr))Auxiliary Mode Valve Actuator Replacement (Delphi) (See:
Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC - Automatic/Auxiliary Mode Valve Actuator
Replacement (Delphi))
* Control Module References (See: Testing and Inspection/Programming and Relearning) for HVAC control module replacement, setup, and
