Chrysler 300M 1999 Manual page 669

REPAIRING MEMORY HEATED SEAT/MIRROR MODULE NO RESPONSE OR
TEST 11A
MHSMM MESSAGES NOT RECEIVED TROUBLE CODE
Perform TEST 1A Before Proceeding
START TEST 11A.
KEY OFF. DISCONNECT
THE MHSMM C4 HARNESS
CONNECTOR.**
FIG. 1
TURN ALL
ACCESSORIES AND
THE COURTESY LAMPS
OFF.
DISCONNECT THE
MHSMM C1 HARNESS
CONNECTOR.**
FIG. 2
USING A VOLTMETER,
MEASURE THE PCI
BUS CIRCUIT.
FIG. 2
KEY OFF.
DISCONNECT THE BCM
C4 HARNESS
CONNECTOR.**
WITH AN OHMMETER,
MEASURE BETWEEN
GROUND AND THE PCI
BUS CIRCUIT.
FIG. 2
*Perform Verification TEST VER-5A.
NOTE: FOR LOCATION
OF ALL COMPONENTS.
SEE GENERAL INFO 4.0
USING A VOLTMETER,
MEASURE THE FUSED
B(+) CIRCUIT. ABOVE 10.0 VOLTS?
FIG. 1
USING AN OHMMETER,
MEASURE BETWEEN IS THE RESISTANCE
GROUND AND THE BELOW 5.0 OHMS?
GROUND CIRCUIT
(CAVITY 1). FIG. 1
TURN THE IGNITION,
HEADLAMPS AND
COURTESY LAMPS ON.
DOES THE VOLTAGE
MODULATE ABOVE 0.3
CONNECT A JUMPER
WIRE BETWEEN
GROUND AND THE PCI
BUS CIRCUIT
(CAVITY 9). FIG. 3
IS THE RESISTANCE
BELOW 5.0 OHMS?
**Check connectors - Clean / repair as necessary.
659
IS THE VOLTAGE NO REPAIR THE OPEN
FUSED B(+)
CIRCUIT.*
YES
NO REPAIR THE OPEN
GROUND CIRCUIT.*
YES
YES REPLACE THE MEMORY
HEATED SEAT/MIRROR
VOLTS?
NO
NO REPAIR THE OPEN
PCI BUS CIRCUIT.*
YES
REPLACE THE BODY
CONTROL MODULE.*
MODULE.*
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