Checking the wiring
- Ignition off.CAUTION:
The blower fan motor power unit is very sensitive to short-circuits and excess current. Do not damage the power unit when taking readings.
Take readings with the power unit connector disconnected when checking the wiring.
Check the signal cable between the fuse and the power unit terminal #A2. Check for an intermittent short-circuit to ground.
Check the signal cable between power unit terminal #B2 and blower fan motor positive terminal. Check for an intermittent short-circuit to ground.
Check the control signal cable between control module terminal #A3 and power unit terminal #A1. Check for an intermittent short-circuit to supply voltage.
Check the diagnostic signal cable between control module terminal #A2 and power unit terminal #A3. Check for an intermittent open-circuit. Check for a short-circuit to ground.
NOTE:If the battery voltage has been interrupted, the blower fan speed must be calibrated. First turn the blower fan speed control to maximum speed and then to minimum speed.
Remedy as necessary.
Other information:
- To access and replace the control module, see Dashboard environment panel (including climate control module (CCM)), replacing
- To connect the breakout box, see Connecting the breakout box
- To access or replace the power unit, see Blower fan motor / power unit, replacing
- With the ignition on and the power unit connector disconnected, the voltage between power unit connector terminal #A2 (control module side) and ground must be approximately 13.5 V
- For other values, see Signal specification
- See Checking wiring and terminals .
- Continue
Refer to Information