Circuit Description
The right air temperature switch assembly is a sliding potentiometer with detents that correspond to fixed resistance values. The instrument panel integration module (IPM) supplies 5 volts to the right air temperature switch signal circuit and provides a low reference circuit. The IPM determines which switch position has been selected by the voltage drop across the corresponding resistance value.
Conditions for Running the DTC
The ignition is turned ON.
Conditions for Setting the DTC
The IPM detects that the right air temperature switch signal circuit is less than 0.09 V (5 counts) or greater than 4.90 V (250 counts).
Action Taken When the DTC Sets
The IPM will ignore the right air temperature switch assembly. The data displayed on the scan tool, 3.19 V (163 counts) in the HVAC System Data list, will be the default value.
Conditions for Clearing the DTC
| • | The DTC will become history if the IPM no longer detects a failure. |
| • | The history DTC will clear after 50 fault-free ignition cycles. |
| • | The DTC can be cleared by using a scan tool. |
Diagnostic Aids
Switch Position | Counts | Volts |
|---|---|---|
COOL | 66 | 1.29 |
COOL | 106 | 2.08 |
COOL | 132 | 2.59 |
COOL | 151 | 2.96 |
NEUTRAL | 164 | 3.21 |
WARM | 174 | 3.41 |
WARM | 182 | 3.57 |
WARM | 189 | 3.70 |
WARM | 194 | 3.80 |
Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views | ||||
1 | Did you perform the HVAC Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the scan tool indicate that the Pass HVAC Control parameter changes value? | -- | Go to Diagnostic Aids | Go to Step 3 |
3 |
Does the voltage measure near the specified value? | 5 V | Go to Step 4 | Go to Step 5 |
4 | Measure the voltage from the right air temperature switch assembly signal circuit of the right air temperature switch assembly to the low reference circuit of the right air temperature switch assembly. Does the voltage measure near the specified value? | 5 V | Go to Step 7 | Go to Step 6 |
5 | Test the right air temperature switch assembly signal circuit of the right air temperature switch assembly for a short to ground, a short to voltage, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 8 |
6 | Test the low reference circuit of the right air temperature switch assembly for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 8 |
7 | Inspect for poor connections at the harness connector of the right air temperature switch assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 9 |
8 | Inspect for poor connections at the harness connector of the instrument panel integration module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 10 |
9 | Replace the right air temperature switch assembly. Refer to Air Temperature Switch Assembly Replacement - Right Side . Did you complete the replacement? | -- | Go to Step 11 | -- |
10 |
Important:: Perform the recalibration procedure for the instrument panel integration module. Replace the instrument panel integration module. Refer to Instrument Panel Module Replacement in Body Control System. Did you complete the replacement? | -- | Go to Step 11 | -- |
11 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
