B1002–A/C SWITCH REQUEST INPUT CIRCUIT HIGH (CCN)
For a complete wiring diagram Refer to Section 8W.
Possible Causes
|
(C105) HVAC MUX CONTROL CIRCUIT SHORTED TO VOLTAGE
|
(C105) HVAC MUX CONTROL CIRCUIT OPEN
|
(C955) HVAC MUX RETURN CIRCUIT OPEN
|
A/C HEATER CONTROL
|
INSTRUMENT CLUSTER (CCN)
|
Diagnostic Test
1.
VERIFY DTC B1002–A/C SWITCH REQUEST INPUT CIRCUIT HIGH IS ACTIVE
Turn the ignition on.
With the scan tool, erase DTCs.
Turn the ignition off, wait 10 seconds, and turn the ignition on.
With the scan tool, read DTCs.
Does the scan tool display this DTC as active?
Yes
No
-
Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related
connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.
-
Perform the BODY VERIFICATION TEST – VER 1.
(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
2.
CHECK THE (C105) HVAC MUX CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the Instrument Cluster C2 harness connector.
Disconnect the HVAC Control Head C1 harness connector.
Turn the ignition on.
Measure the voltage of the (C105) HVAC MUX Control circuit.
Is there any voltage present?
Yes
No
3.
CHECK THE (C105) HVAC MUX CONTROL CIRCUIT FOR AN OPEN
Turn the ignition off.
Measure the resistance of the (C105) HVAC MUX Control circuit between the A/C Heater Control C1 harness connector and the Instrument Cluster C2 harness connector.
Does the ohm meter read open circuit?
Yes
No
4.
CHECK THE (C955) HVAC MUX RETURN CIRCUIT FOR AN OPEN
Measure the resistance of the (C955) HVAC MUX Return circuit between the A/C Heater Control C1 harness connector and the Instrument Cluster C2 harness connector.
Does the ohm meter read open circuit?
Yes
No
5.
CHECK THE OPERATION OF THE INSTRUMENT CLUSTER (CCN)
Reconnect the Instrument Cluster (CCN) harness connector.
Turn the ignition on.
With the scan tool, read DTCs.
Does the scan tool display this DTC as active?
Yes
No