Ford 2003 Mustang Workshop Manual page 3847

The luggage compartment door
is inoperative using the remote
transmitter
Panic function does not operate
correctly
Pinpoint Tests
PINPOINT TEST A: NO COMMUNICATION WITH THE GENERIC
ELECTRONIC MODULE
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to
use the correct probe adapter(s) may damage the connector.
A1 CHECK THE GENERIC ELECTRONIC MODULE (GEM)
POWER SUPPLY
Key in OFF position.
Disconnect: Generic Electronic Module (GEM) C201a.
Disconnect: GEM C201b.
Key in ON position.
Using the following table, measure the voltage between the
GEM, harness side and ground.
Connector Pin
C201a 4
C201a 1
C201b 2
C201b 3
Are the voltages greater than 10 volts?
A2 CHECK THE GEM GROUND CIRCUIT 397 (BK/WH) FOR
OPEN
Key in OFF position.
Test Step
Circuit
400 (LB/BK)
1006 (DG/WH)
1001 (WH/YE)
193 (YE/LG)
Remote transmitter.
Remote transmitter
batteries.
CJB Fuse 25 (25A).
Remote transmitter
batteries.
Remote transmitter.
GEM.
Circuitry.
Luggage
compartment lid
release relay.
GEM.
Driver door unlock
relay.
Circuitry.
Remote transmitter
and batteries.
Courtesy lamps.
Horn relay.
Horn.
Parklamps.
Result / Action to Take
Yes
GO to
No
REPAIR the circuit(s) in
question. TEST the system
for normal operation.
Yes
Test C .
GO to
Pinpoint
Test D .
GO to
Pinpoint
Test E .
A2 .