Diagnostic Test

WARNING: This page is about a different car, the 2007 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

1) VERIFY DTC B1083-HVAC MUX SWITCH HIGH IS ACTIVE
Turn the ignition on.

With the scan tool, read Gateway DTCs.

Does the scan tool display active: B1083-HVAC MUX SWITCH HIGH?

Yes
1. Go to 2).
No
1. Go to 4).
2) CHECK FOR A SHORTED GATEWAY MODULE

Fig 1: Gateway Module C2 Harness Connector
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the Gateway Module C2 harness connector.

Connect the positive lead of an ammeter to the (C18) A/C Select circuit in the Gateway Module C2 harness connector and the negative lead to a good clean chassis ground.

Turn the ignition on.

Is the reading above 0.06 amps?

Yes
1. Go to 3).
No
1. Replace the Gateway Module in accordance with the Service Information.
2. Perform GATEWAY VERIFICATION TEST - VER.
3) CHECK THE (C18) A/C SELECT CIRCUIT FOR A SHORT TO OTHER CIRCUITS
Turn the ignition off.

Using the wiring diagram/schematic as a guide, inspect the related wiring and connectors for chafed, pierced, pinched and partially broken wires and for broken, bent, pushed out, corroded and contaminated terminals. Repair as necessary.

Were any problems found?

Yes
1. Repair as necessary.
2. Perform GATEWAY VERIFICATION TEST - VER 1.
No
1. Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
2. Perform POWERTRAIN VERIFICATION TEST .
4) TEST FOR INTERMITTENT CONDITION
NOTE: The condition that set this DTC is not present at this time. The following may help in identifying the cause of the intermittent condition.

Check the Technical Service Bulletins (TSBs) for related concerns.

Using the scan tool, erase TIPM DTCs.

Turn the ignition off, wait 10 seconds, then turn the ignition on.

Monitor the scan tool for DTCs while wiggling the related wiring harness.

Turn the ignition off.

Using the wiring diagram/schematic as a guide, inspect the related wiring and connectors for chafed, pierced, pinched and partially broken wires and for broken, bent, pushed out, corroded and contaminated terminals. Repair as necessary.

If numerous DTC were set, use the wiring diagram/schematic to check for common ground and supply circuits.

Were any problems found?

Yes
1. Repair as necessary.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Test Complete.