B1082-HVAC MUX CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With the ignition on.
- Set Condition:
If the Instrument Cluster (CCN) detects voltage below 0.55 volts for 10 seconds on the (C221) A/C Switch Sense circuit.
| Possible Causes |
| (C221) A/C SWITCH SENSE CIRCUIT SHORTED TO GROUND |
| INSTRUMENT CLUSTER (CCN) |
| A/C HEATER CONTROL |
Diagnostic Test
1. VERIFY DTC B1082–HVAC MUX CIRCUIT LOW IS ACTIVETurn the ignition on.
With the scan tool, erase CCN DTCs.
Turn the ignition off, wait 10 seconds, and turn the ignition on.
With the scan tool, read CCN DTCs.
Does the scan tool display active: B1082–HVAC MUX CIRCUIT LOW?
Yes
- Go To 2
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.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
2. CHECK FOR DTC B1082–HVAC MUX CIRCUIT LOW WITH A/C HEATER CONTROL C1 HARNESS CONNECTOR DISCONNECTED
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
With the scan tool, erase CCN DTCs.
Turn the ignition off, wait 10 seconds, and turn the ignition on.
With the scan tool, read CCN DTCs.
Does the scan tool display: B1082–HVAC MUX CIRCUIT LOW?
Yes
- Go To 3
No
- Replace the A/C Heater Control in accordance with the Service Information.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
3. CHECK (C221) A/C SWITCH SENSE CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Disconnect the Instrument Cluster C3 harness connector.
Measure the resistance of the (C221) A/C Switch Sense circuit between ground and the A/C Heater Control C1 harness connector.
Is the resistance below 10k ohms?
Yes
- Repair the (C221) A/C Switch Sense circuit for a short to ground.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Replace the Instrument Cluster (CCN) in accordance with the Service Information.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).