B1001

B1001-A/C SWITCH REQUEST INPUT CIRCUIT LOW (SINGLE-ZONE)

For a complete wiring diagram refer to Diagrams/Electrical.

Theory of Operation

The A/C mode switch input changes when the switch is pushed down. A stored DTC B1001 indicates that the A/C mode switch was stuck in a pushed position for more than two minutes, but has since returned to its normal state. An active DTC B1001 indicates that the A/C mode switch is stuck in a pushed position. An active DTC B1001 will also prevent proper A/C mode switch and status indicator function as evidenced by not being able to turn the A/C status indicator either on if off or off if on.

- When Monitored:

With the ignition on.

- Set Condition:

If the A/C mode switch stays in a pushed position for more than two minutes. This DTC has a maturing time of two minutes and a de-maturing time of two seconds. If the DTC's status changes from active to stored it will stay in memory for 100 ignition cycles.






Diagnostic Test

1. INSPECT THE A/C HEATER CONTROL FOR DAMAGE

Inspect the A/C Heater Control for damage.

Is the A/C Heater Control damaged?

Yes

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

No

- Go To 2

2. INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE A/C MODE SWITCH TO STAY OR STICK IN A PUSHED POSITION

Inspect the A/C Heater Control for anything that would cause the A/C mode switch to stay or stick in a pushed position.

Is anything present that would cause the A/C mode switch to stay or stick in a pushed position?

Yes

- Repair as necessary.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 3

3. CHECK FOR NORMAL A/C MODE SWITCH & STATUS INDICATOR FUNCTION

Turn the ignition on.

Turn the blower control on.

Press the A/C mode switch on and off several times while observing the A/C status indicator.

Does the A/C status indicator turn on and off with respect to the switch position?

Yes

- Go To 4

No

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

4. VERIFY THAT DTC B1001-A/C SWITCH REQUEST INPUT CIRCUIT LOW IS STILL ACTIVE

Turn the blower control off.

With the scan tool, erase HVAC DTCs.

Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait two minutes before proceeding.

With the scan tool, read HVAC DTCs.

Does the scan tool display active: B1001-A/C SWITCH REQUEST INPUT CIRCUIT LOW?

Yes

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

No

- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test