Motor or PCM – Check:
a) Electrical function – Open circuit motor.
b) Electrical function – Open circuit PCM.
Test Procedure – Open circuit Motor:
a) Disconnect the Motor connector at the PCM.
b) Using a multimeter set for resistance (Ohms) measure across pins A and B.
c) Check for an open circuit.
If and open circuit is detected, go to Motor replacement, page 3-23.
If an open circuit is not detected, go to Test Procedure – Open circuit PCM.
Test Procedure – Open circuit PCM:
a) Disconnect the Motor connector and Temperature Sensor 1 at the PCM.
b) Reconnect the power and switch harnesses at the PCM.
c) Switch the PROHEAT on and measure voltage across pins A and B of the
PCM Motor connection.
If the correct nominal system voltage (12 or 24) is measured, the PCM is
OK. Go to Test Procedure – Open circuit Motor.
If no voltage is measured, the PCM is faulty. Go to PCM replacement,
page 3-39.
Figure 3-27: Motor Electrical Resistance Measurement
MOTOR
Figure 3-29: PCM Motor Output Voltage Measurement
LOCK
Figure 3-28: Connector Removal
LOCK
Figure 3-26: Connector Removal
PCM MOTOR CONNECTION
MOTOR
PROHEAT M-SERIES SERVICE MANUAL
3-22
START: Motor and/or
PCM fault
(1 Flash)
CAUTION
DO NOT connect Motor directly to
batteries or another power source
as it will damage the Motor.
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