TEST
ACTION
APPLICABILITY
4
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?
All
Yes
→ Repair the door driver circuit for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 5
5
Turn the ignition off.
Ensure that the A/C Heater Control C1 harness connector is connected to the A/C
Heater Control.
Turn the ignition on.
With the DRBIII
t in HVAC, System Tests, actuate the Actuator Circuit Test.
What message does the DRBIII
t display?
All
Same msg as from start of test
Replace the A/C Heater Control in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
Different msg 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 msg. Repair as necessary. If DRB displays a msg
for a different door driver ckt, return to Test 1 of this Symptom.
Perform BODY VERIFICATION TEST - VER 1.
6
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?
All
Yes
→ Repair all door driver circuits with voltage present for a short to
voltage.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 7
7
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
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?
All
Yes
→ Repair all door driver circuits with a resistance below 10K ohms
for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 8
553
HEATING & A/C
BLEND CIRCUIT SHORTED TO GROUND - MTC —
Continued