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Short Too Complex-(MTC)







SHORT TOO COMPLEX-MTC

For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
When the Actuator Circuit Test is executed.

- Set Condition:
This message will set if the A/C Heater Control detects more than three drivers shorted in the same direction (e.g., four drivers, all shorted to ground) or if two or more drivers are shorted with at least one driver shorted to ignition/battery and one driver shorted to ground.





Diagnostic Test

1. IDENTIFY CORRECT PROCEDURE STEPS TO DIAGNOSE MESSAGE

CAUTION: 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.

CAUTION: The scan tool can display up to three Actuator Circuit Test fault messages at a time. After repairing each fault message, cycle the ignition switch, then run the Actuator Circuit Test again to ensure no new faults exist.

Which Actuator Circuit Test message is present?

XXX Driver/Ckt Short to Gnd

- Go To2

XXX Driver/Ckt Short to Ign or Batt

- Go To4

Short Too Complex

- Go To6

XXX Driver/Ckt Short to Gnd & to Ign or Bat

- Go To8

2. DOOR DRIVER CIRCUIT SHORTED LOW
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Measure the resistance between ground and the applicable Door Driver circuit.
Does the ohm meter read open circuit?

Yes

- Go To3

No

- Repair the door driver circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

3. DOOR ACTUATOR SHORTED
Measure the resistance between the Common Door Driver circuit and the applicable door driver circuit.
Is the resistance below 30.0 ohms?

Yes

- Replace the Door Actuator.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Go To5

4. DOOR DRIVER CIRCUIT SHORTED HIGH
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
Measure the voltage between the applicable Door Driver circuit and ground.
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 To5

5. A/C HEATER CONTROL
Turn the ignition on.
With the scan tool in HVAC, System Tests, perform the Actuator Circuit Test.
What message does the scan tool 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 & connectors for conditions causing an intermittent short that set the original test message. Repair as necessary. If the scan tool displays a message for a different door driver circuit, return to Test 1 of this Symptom.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

6. DOOR DRIVER CIRCUITS SHORTED HIGH
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
Measure the voltage of each of the Door Driver circuits (Common, Driver Blend, Mode, Passenger Blend, & Recirc).
Is there 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 To7

7. DOOR DRIVER CIRCUITS SHORTED LOW
Measure the resistance between ground and each of the Door Driver circuits (Common, Driver Blend, Mode, Passenger Blend, & Recirc).
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 To8

8. DOOR DRIVER CIRCUITS SHORTED TOGETHER
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Measure the resistance between the Recirculation Door Driver circuit and the Driver Blend Door Driver circuit, the Passenger Blend Door Driver circuit, and the Mode Door Driver circuit.
Measure the resistance between the Driver Blend Door Driver circuit and the Passenger Blend Door Driver circuit and the Mode Door Driver circuit.
Measure the resistance between the Mode Door Driver circuit and the Passenger Blend Door Driver circuit.
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 together.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Go To9

9. CHECK EACH DOOR ACTUATOR'S CIRCUIT RESISTANCE
Measure the resistance between the Common Door Driver circuit and the Recirculation Door Driver circuit, the Driver Blend Door Driver circuit, the Passenger Blend Door Driver circuit, and the Mode Door Driver circuit.
Is the resistance below 30.0 ohms on any of the circuits?

Yes

- Go To10

No

- Go To11

10. DOOR DRIVER CIRCUITS SHORTED TO COMMON DOOR DRIVER CIRCUIT
Disconnect all Door Actuator harness connectors whose circuit resistance was below 30.0 ohms.
Measure the resistance between the Common Door Driver circuit and each applicable Door Driver circuit.
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 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.

11. A/C HEATER CONTROL
Turn the ignition on.
With the scan tool in HVAC, System Tests, perform the Actuator Circuit Test.
What message does the scan tool 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 & connectors for conditions causing an intermittent short that set the original test message. Repair as necessary. If the scan tool displays a message for a different door driver circuit, return to Test 1 of this Symptom.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

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