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Actuator Circuit Test Diagnostics (Single-Zone)

ACTUATOR CIRCUIT TEST DIAGNOSTICS (SINGLE-ZONE)

Actuator Circuit Test Diagnostics (Single-Zone):





Theory of Operation
By running the Actuator Circuit Test, the A/C Heater Control can identify up to three door driver circuits shorted simultaneously. A Short Too Complex fault will set if more than three door driver circuits are shorted in the same direction (e.g. four door driver circuits all shorted to ground) or if two or more door driver circuits are shorted with at least one door driver circuit shorted to ignition and one door driver circuit shorted to ground. Fault messages displaying XXX Driver/Circuit Shorted to Ignition/Battery and XXX Driver/Circuit Shorted to Ground will set on a per-driver basis. Fault messages displaying the same two drivers/circuits shorted to ignition/battery as-well-as shorted to ground indicates that two actuator driver circuits are shorted together. To ensure a proper diagnosis, repair all Short Too Complex fault messages first, all common door driver circuit related fault messages second, and all other fault messages last. In addition, always test the door driver circuits after each repair by cycling the ignition switch and then running the Actuator Circuit Test again to ensure that no new faults exits.

Diagnostic Test

1. SELECT THE CORRECT PROCEDURE STEPS TO DIAGNOSE THE ACTUATOR CIRCUIT TEST FAULT(S)

Q: Which Actuator Circuit Test message is present?

XXX Driver/Circuit Shorted to Ground
Go To 2

XXX Driver/Circuit Shorted to Ignition or Battery
Go To 4

Short Too Complex
Go To 6

XXX Driver/Circuit Shorted to Ground & to Ignition or Battery
Go To 8

2. CHECK THE DOOR DRIVER CIRCUIT IDENTIFIED IN THE ACTUATOR CIRCUIT TEST MESSAGE FORA SHORT TO GROUND




Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Measure the resistance of the applicable door driver circuit between ground and the A/C Heater Control C1 harness connector.

Q: Is the resistance below 10k ohms?

YES: Repair the door driver circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 3

3. CHECK THE RESISTANCE BETWEEN THE (C34) COMMON DOOR DRIVER CIRCUIT & THE DOOR DRIVER CIRCUIT TESTED IN THE PREVIOUS STEP




Measure the resistance between the (C34) Common Door Driver circuit and the applicable door driver circuit in the A/C Heater Control C1 harness connector.

Q: Is the resistance below 30.0 ohms?

YES: Replace the door actuator. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 5

4. CHECK THE DOOR DRIVER CIRCUIT IDENTIFIED IN THE ACTUATOR CIRCUIT TEST MESSAGE FORA SHORT TO VOLTAGE




Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
Measure the voltage of the applicable door driver circuit.

Q: Is there any voltage present?

YES: Repair the door driver circuit for a short to voltage. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 5

5. RUN THE ACTUATOR CIRCUIT TEST
Turn the ignition off.
Reconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
With the DRBIII(R) in HVAC, select System Tests and then select Actuator Circuit Test.
Allow the test to run to completion before proceeding.

Q: What message does the DRBIII(R) display?

Same message as from start of test
Replace the A/C Heater Control. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

Different message than from start of test
Using the wiring diagram as a guide, inspect the wiring and connectors for conditions causing an intermittent short that set the original test message. Repair as necessary. If the DRBIII(R) displays a message for a different door driver circuit, return to Step 1 of this diagnostic procedure. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

6. CHECK THE (C34) COMMON DOOR DRIVER CIRCUIT, THE (C32) RECIRCULATION DOOR DRIVER CIRCUIT, THE (C61) BLEND DOOR DRIVER CIRCUIT, THE (C801) MODE DOOR 1 DRIVER CIRCUIT, & THE (C29) MODE DOOR 2 DRIVER CIRCUIT FOR A SHORT TO VOLTAGE




Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
Measure the voltage of the (C34) Common Door Driver Circuit, the (C32) Recirculation Door Driver circuit, the (C61) Blend Door Driver circuit, the (C801) Mode Door 1 Driver circuit, and the (C29) Mode Door 2 Driver circuit.

Q: Is there any voltage present on any of the circuits?

YES: Repair all door driver circuits with voltage present for a short to voltage. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 7

7. CHECK THE (C34) COMMON DOOR DRIVER CIRCUIT, THE (C32) RECIRCULATION DOOR DRIVER CIRCUIT, THE (C61) BLEND DOOR DRIVER CIRCUIT, THE (C801) MODE DOOR 1 DRIVER CIRCUIT, & THE (C29) MODE DOOR 2 DRIVER CIRCUIT FOR A SHORT TO GROUND




Turn the ignition off.
Measure the resistance of the (C34) Common Door Driver Circuit, the (C32) Recirculation Door Driver circuit, the (C61) Blend Door Driver circuit, the (C801) Mode Door 1 Driver circuit, and the (C29) Mode Door 2 Driver circuit between ground and the A/C Heater Control C1 harness connector.

Q: Is the resistance below 10k ohms on any of the circuits?

YES: Repair all door driver circuits with a resistance below 10k ohms for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 8

8. CHECK THE (C32) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C61) BLEND DOOR DRIVER CIRCUIT, THE (C801) MODE DOOR 1 DRIVER CIRCUIT, & THE (C29) MODE DOOR 2 DRIVER CIRCUIT




Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Measure the resistance between the (C32) Recirculation Door Driver circuit and the (C61) Blend Door Driver circuit, the (C801) Mode Door 1 Driver circuit, and the (C29) Mode Door 2 Driver circuit in the A/C Heater Control C1 harness connector.

Q: Is the resistance below 10k ohms on any of the circuits?

YES: Repair all circuits with a resistance below 10k ohms for a short to the (C32) Recirculation Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 9

9. CHECK THE (C61) BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C801) MODE DOOR 1 DRIVER CIRCUIT & THE (C29) MODE DOOR 2 DRIVER CIRCUIT




Measure the resistance between the (C61) Blend Door Driver circuit and the (C801) Mode Door 1 Driver circuit and the (C29) Mode Door 2 Driver circuit in the A/C Heater Control C1 harness connector.

Q: Is the resistance below 10k ohms on any of the circuits?

YES: Repair all circuits with a resistance below 10k ohms for a short to the (C61) Blend Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 10

10. CHECK THE (C801) MODE DOOR 1 DRIVER CIRCUIT FOR A SHORT TO THE (C29) MODE DOOR 2 DRIVER CIRCUIT




Measure the resistance between the (C801) Mode Door 1 Driver circuit and the (C29) Mode Door 2 Driver circuit in the A/C Heater Control C1 harness connector.

Q: Is the resistance below 10k ohms?

YES: Repair the (C29) Mode Door 2 Driver circuit for a short to the (C801) Mode Door 1 Driver circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 11

11. CHECK THE (C34) COMMON DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C32) RECIRCULATION DOOR DRIVER CIRCUIT, THE (C61) BLEND DOOR DRIVER CIRCUIT, THE (C801) MODE DOOR 1 DRIVER CIRCUIT, & THE (C29) MODE DOOR 2 DRIVER CIRCUIT




Measure the resistance between the (C34) Common Door Driver Circuit and the (C32) Recirculation Door Driver circuit, the (C61) Blend Door Driver circuit, the (C801) Mode Door 1 Driver circuit, and the (C29) Mode Door 2 Driver circuit in the A/C Heater Control C1 harness connector.

Q: Is the resistance below 30.0 ohms on any of the circuits?

YES: Go To 12
NO: Go To 13

12. CHECK THE DOOR DRIVER CIRCUITS WHOSE RESISTANCE WAS BELOW 30.0 OHMS IN THE PREVIOUS STEP FOR A SHORT TO THE (C34) COMMON DOOR DRIVER CIRCUIT




Disconnect all door actuator harness connectors whose circuit resistance was below 30.0 ohms.
Measure the resistance between the (C34) Common Door Driver circuit and each applicable door driver circuit in the A/C Heater Control C1 harness connector.

Q: Is the resistance below 10k ohms on any of the circuits?

YES: Repair the door driver circuits with a resistance below 10k ohms for a short to the (C34) Common Door Driver circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace all door actuators with a resistance below 30.0 ohms. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

13. RUN THE ACTUATOR CIRCUIT TEST
Reconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
With the DRBIII(R) in HVAC, select System Tests and then select Actuator Circuit Test.
Allow the test to run to completion before proceeding.

Q: What message does the DRBIII(R) display?

Same message as from start of test
Replace the A/C Heater Control. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

Different message than from start of test
Using the wiring diagram as a guide, inspect the wiring and connectors for conditions causing an intermittent short that set the original test message. Repair as necessary. If the DRBIII(R) displays a message for a different door driver circuit, return to Test 1 of this diagnostic procedure. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

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