DTC 81: Blower Not On High At Start Of Cooldown Test: Notes

Fig 1: Blower Switch Position Signal Circuit Schematic

Courtesy of CHRYSLER LLC

For complete wiring diagrams refer to:

SYSTEM WIRING DIAGRAMS for 300.
SYSTEM WIRING DIAGRAMS for Charger.

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

Possible Causes
BLOWER CONTROL NOT SET TO HIGH SPEED WHEN EXECUTING THE COOL DOWN TEST
BLOWER MOTOR / RELATED CIRCUITS
(C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT SHORTED TO (Z908) GROUND CIRCUIT
(C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT SHORTED TO (Z909) GROUND CIRCUIT
(C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT SHORTED TO GROUND
(C850) 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 Cool down Test. Otherwise, it will display as stored until cleared.