B100C

B100C-FLOOR MODE SWITCH REQUEST INPUT CIRCUIT PERFORMANCE



Theory of Operation

The HVAC Front A/C Heater Module contains various switches and knobs that are used to change the systems operation. Many of the switches are momentary switches which are normally open or in the Off position and the status changes when the switch button or knob is pushed or turned. An active Diagnostic Trouble Code (DTC) indicates that the switch is stuck in an On position. A stored DTC indicates that the switch was stuck in a On position for more than two minutes but has since returned to its normal state of Off.

- When Monitored:
With the ignition on.

- Set Condition:
If the Floor Mode Switch is stuck in an On position for more than two minutes. This DTC has a de-maturing time of one second. If the DTCs status changes from active to stored, the DTC will stay in memory for 100 ignition cycles.





Always perform the HVAC Pre-Diagnostic Troubleshooting procedure before proceeding Initial Inspection and Diagnostic Overview.

1. INSPECT FOR OBJECT HOLDING SWITCH IN AN ON POSITION
1. Inspect the Front A/C Heater Module for an object or debris holding the Floor Mode Switch in an On position.

NOTE: Using the scan tool you can read the On/Off status of the control switch.

Is the Floor Mode switch being held in or stuck On?

Yes

- Clean or repair the Front A/C Heater Module as necessary. If you are unable to clean the switch to where the switch can work properly, replace and program the Front A/C Heater Module.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Go To 2

2. FRONT A/C HEATER MODULE
1. Turn the ignition on.
2. Using the scan tool, erase HVAC DTCs.
3. Turn the ignition off for 10 seconds, and then turn the ignition on and wait a minimum of two minutes.
4. Using the scan tool, read HVAC DTCs.

Does the scan tool display this DTC as Active or is the status of the switch reading On?

Yes

- Replace and program the Front A/C Heater Module.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Test complete.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.