Page 1 of 14 *ACTUATOR CIRCUIT TEST DIAGNOSTICS (DUAL-ZONE)
Page 2 of 14 For a complete wiring diagram Refer to Section 8W. 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) Which Actuator Circuit Test fault 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
Page 3 of 14 TEST MESSAGE FOR A 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. Is the resistance below 10k ohms? Repair the door driver circuit for a short to ground. Go To 3 3. CHECK THE RESISTANCE BETWEEN THE (C34) COMMON DOOR DRIVER CIRCUIT & THE DOOR DRIVER CIRCUIT TESTED IN THE PREVIOUS STEP
Page 4 of 14 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. Is the resistance below 30.0 ohms? Replace the door actuator in accordance with the Service Information. Go To 5 4. CHECK THE DOOR DRIVER CIRCUIT IDENTIFIED IN THE ACTUATOR CIRCUIT TEST MESSAGE FOR A SHORT TO VOLTAGE
Page 5 of 14 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. Is there any voltage present? Repair the door driver circuit for a short to voltage. 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 in HVAC, select System Tests and then select Actuator Circuit Test. Allow the test to run to completion before proceeding.
Page 6 of 14 What message does the DRBIII display? Same message as from start of test Replace the A/C Heater Control in accordance with the Service Information. 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 displays a message for a different door driver circuit, return to Step 1 of this diagnostic procedure. 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, & THE (C33) PASSENGER BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off.
Page 7 of 14 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, the (C29) Mode Door 2 Driver circuit, and the (C33) Passenger Blend Door Driver circuit. Is there any voltage present on any of the circuits? Repair all door driver circuits with voltage present for a short to voltage. 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, & THE (C33) PASSENGER BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO GROUND
Page 8 of 14 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, the (C29) Mode Door 2 Driver circuit, and the (C33) Passenger Blend Door Driver circuit between ground and the A/C Heater Control C1 harness connector. Is the resistance below 10k ohms on any of the circuits? Repair all door driver circuits with a resistance below 10k ohms for a short to ground. 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, & THE (C33) PASSENGER BLEND DOOR DRIVER CIRCUIT
Page 9 of 14 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, the (C29) Mode Door 2 Driver circuit, and the (C33) Passenger Blend Door Driver circuit in the A/C Heater Control C1 harness connector. Is the resistance below 10k ohms on any of the circuits? Repair all circuits with a resistance below 10k ohms for a short to the (C32) Recirculation Door Driver circuit. 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,& THE (C33) PASSENGER BLEND DOOR DRIVER CIRCUIT
Page 10 of 14 Measure the resistance between the (C61) Blend Door Driver circuit and the (C801) Mode Door 1 Driver circuit, the (C29) Mode Door 2 Driver circuit, and the (C33) Passenger Blend Door Driver circuit in the A/C Heater Control C1 harness connector. Is the resistance below 10k ohms on any of the circuits? Repair all circuits with a resistance below 10k ohms for a short to the (C61) Blend Door Driver circuit. Go To 10 10. CHECK THE (C801) MODE DOOR 1 DRIVER CIRCUIT FOR A SHORT TO THE (C29) MODE DOOR 2 DRIVER CIRCUIT & THE (C33) PASSENGER BLEND DOOR DRIVER CIRCUIT Measure the resistance between the (C801) Mode Door 1 Driver circuit and the (C29) Mode Door 2 Driver circuit, and the (C33) Passenger Blend Door Driver circuit in the A/C Heater Control C1
Page 11 of 14 harness connector. Is the resistance below 10k ohms on any of the circuits? Repair all circuits with a resistance below 10k ohms for a short to the (C801) Mode Door 1 Driver circuit. Go To 11 11. CHECK THE (C29) MODE DOOR 2 DRIVER CIRCUIT FOR A SHORT TO THE (C33) PASSENGER BLEND DOOR DRIVER CIRCUIT Measure the resistance between the (C29) Mode Door 2 Driver circuit and the (C33) Passenger Blend Door Driver circuit in the A/C Heater Control C1 harness connector. Is the resistance below 10k ohms?
Page 12 of 14 Repair the (C33) Passenger Blend Door Driver circuit for a short to the (C29) Mode Door 2 Driver circuit. Go To 12 12. 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, & THE (C33) PASSENGER BLEND DOOR 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, the (C29) Mode Door 2 Driver circuit, and the (C33) Passenger Blend Door Driver circuit in the A/C Heater Control C1 harness connector. Is the resistance below 30.0 ohms on any of the circuits? Go To 13
Page 13 of 14 Go To 14 13. 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. Is the resistance below 10k ohms on any of the circuits? Repair the door driver circuits with a resistance below 10k ohms for a short to the (C34) Common Door Driver circuit.
Page 14 of 14 Replace all door actuators with a resistance below 30.0 ohms in accordance with the Service Information. 14. RUN THE ACTUATOR CIRCUIT TEST Reconnect the A/C Heater Control C1 harness connector. Turn the ignition on. With the DRBIII in HVAC, select System Tests and then select Actuator Circuit Test. Allow the test to run to completion before proceeding. What message does the DRBIII display? Same message as from start of test Replace the A/C Heater Control in accordance with the Service Information. 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 displays a message for a different door driver circuit, return to Test 1 of this diagnostic procedure.