B1083

B1083-HVAC MUX CIRCUIT HIGH





For a complete wiring diagram Refer to Diagrams/Electrical.

- When Monitored:

With the ignition on.

- Set Condition:

If the Instrument Cluster (CCN) detects voltage above 4.5 volts for 10 seconds on the (C105) HVAC MUX Control circuit.





Diagnostic Test

1.VERIFY DTC B1083-HVAC MUX CIRCUIT HIGH IS ACTIVE

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 active: B1083-HVAC MUX CIRCUIT HIGH?

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. Body Verification Test

2.CHECK (C105) HVAC MUX CONTROL CIRCUIT VOLTAGE AT A/C HEATER CONTROL C1 HARNESS CONNECTOR





Turn the ignition off.

Disconnect the A/C Heater Control C1 harness connector.

Turn the ignition on.

Measure the voltage of the (C105) HVAC MUX Control circuit.

What is the voltage?

Below 4.8 Volts

- Go To 3

4.8 to 5.2 Volts

- Replace the A/C Heater Control.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

Above 5.2 Volts

- Go To 4

3.CHECK (C105) HVAC MUX CONTROL CIRCUIT FOR AN OPEN





Turn the ignition off.

Disconnect the Instrument Cluster C2 harness connector.

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.

Is the resistance below 5.0 ohms?

Yes

- Replace the Instrument Cluster (CCN).
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Repair the (C105) HVAC MUX Control circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

4.CHECK (C105) HVAC MUX CONTROL CIRCUIT FOR A SHORT TO VOLTAGE





Turn the ignition off.

Disconnect the Instrument Cluster C2 harness connector.

Turn the ignition on.

Measure the voltage of the (C105) HVAC MUX Control circuit.

Is the voltage above 0.2 volts?

Yes

- Repair the (C105) HVAC MUX Control circuit for a short to voltage.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Replace the Instrument Cluster (CCN).
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test