Pinpoint Test W: The Auxiliary Temperature Control Is Inoperative Using The Front Auxiliary Climate Controls
Climate Control System
Pinpoint Tests
Pinpoint Test W: The Auxiliary Temperature Control is Inoperative Using the Front Auxiliary Climate Controls
Refer to Wiring Diagram Set 52, Auxiliary Climate Control for schematic and connector information. Diagrams By Number
Normal Operation
Under normal operation, the auxiliary temperature blend door actuator is supplied voltage and ground. A signal voltage is received by the auxiliary temperature blend door actuator from the front auxiliary temperature control to command the auxiliary temperature blend door actuator position.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Front auxiliary climate control assembly
- Auxiliary temperature blend door actuator
- Broken/binding auxiliary temperature blend door
PINPOINT TEST W: THE AUXILIARY TEMPERATURE CONTROL IS INOPERATIVE USING THE FRONT AUXILIARY CLIMATE CONTROLS
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W1 CHECK VOLTAGE TO BLEND DOOR ACTUATOR
- Disconnect: Auxiliary Temperature Blend Door Actuator C3004.
- Ignition ON.
- Measure the voltage between ground and auxiliary temperature blend door actuator C3004-7, circuit CBP18 (GY/OG), harness side.
- Is the voltage greater than 10 volts?
Yes
GO to W2.
No
VERIFY the Smart Junction Box (SJB) fuse 18 (10A) is OK. If OK, REPAIR circuit CBP18 (GY/OG) for an open. TEST the system for normal operation.
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W2 CHECK THE BLEND DOOR ACTUATOR GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between ground and auxiliary temperature blend door actuator C3004-8, circuit GD149 (BK/GY), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to W3.
No
REPAIR circuit GD149 (BK/GY) for an open. TEST the system for normal operation.
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W3 CHECK THE TEMPERATURE BLEND DOOR ACTUATOR SIGNAL
- Ignition ON.
- Place the front auxiliary blower motor switch in HI.
- Measure the voltage between ground and auxiliary temperature blend door actuator C3004-3, circuit VHA09 (VT/BN), harness side.
- Rotate the temperature control switch to full COOL then to full WARM.
- Does the voltage vary from greater than 10 volts (full COOL) to less than 1 volt (full WARM)?
Yes
Check for a broken/binding auxiliary temperature blend door. If OK, INSTALL a new auxiliary temperature blend door actuator. TEST the system for normal operation.
No
GO to W4.
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W4 CHECK CIRCUIT VHA09 (VT/BN) FOR AN OPEN
- Ignition OFF.
- Disconnect: Front Auxiliary Climate Control Assembly C951B.
- Measure the resistance between front auxiliary climate control assembly C951B-3, circuit VHA09 (VT/BN), harness side and auxiliary temperature blend door actuator C3004-3, circuit VHA09 (VT/BN), harness side.
- Is the resistance less than 5 ohms?
Yes
INSTALL a new front auxiliary climate control assembly. TEST the system for normal operation.
No
REPAIR circuit VHA09 (VT/BN) for an open. TEST the system for normal operation.
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