81-Blower Not On High At Start Of Cooldown Test (MTC): Notes

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Blower Switch Position Circuit Diagram

Courtesy of DAIMLERCHRYSLER CORP.

For the Manual Temperature Control (MTC) circuit diagram (Refer to HEATING & AIR CONDITIONING - SCHEMATICS AND DIAGRAMS) .

For a complete wiring diagram refer to SYSTEM WIRING DIAGRAMS .

When Monitored:
When executing the Cooldown Test.
Set Condition:
If the A/C Heater Control sensed that the blower was not operating at high speed when executing the Cooldown Test.

Possible Causes
BLOWER CONTROL NOT SET TO HIGH SPEED WHEN EXECUTING THE COOLDOWN TEST
BLOWER MOTOR/RELATED CIRCUITS
(C41) BLOWER SWITCH POSITION SIGNAL CIRCUIT SHORTED TO (C121) SENSOR GROUND CIRCUIT
(C41) BLOWER SWITCH POSITION SIGNAL CIRCUIT SHORTED TO GROUND
(C41) BLOWER SWITCH POSITION SIGNAL CIRCUIT OPEN
A/C HEATER CONTROL

NOTE: This DTC will display as active if the ignition is not cycled after running the Cooldown Test. Otherwise, it will display as stored until cleared.