2003 FORD MUSTANG Workshop Manual

Page 3857 of 4378

FORD MUSTANG 2003  Workshop Manual relay Pin 5 Circuit 931 (OG), harness side and ground 
�z Is the voltage greater than 10 volts?  REPAIR Circuit 931 (OG). 
REPEAT the self-
test. CLEAR 
the DTCs.  D7 BYPASS THE GEM AND RELAY CONTROL

Page 3858 of 4378

FORD MUSTANG 2003  Workshop Manual Circuit 599 (PK/LG), harness side and ground. 
�z Is the resistance greater than 10,000 ohms?  GO to 
D11  . 
No 
REPAIR Circuit 599 (PK/LG). 
REPEAT the self- test. CLEAR 
the DTCs.  D11 CHECK CIRCUI

Page 3859 of 4378

FORD MUSTANG 2003  Workshop Manual PINPOINT TEST E: PANIC FUNCTION DOES NOT OPERATE 
CORRECTLY  �z
Is the resistance less than 5 ohms?  D14 CHECK CIRCUIT 1205 (BK) FOR OPEN 
�z
Measure the resistance between luggage compartment 
lid re

Page 3860 of 4378

FORD MUSTANG 2003  Workshop Manual normal operation. 
E4 CHECK THE GEM OUTPUT TO THE HORN 
�z
Connect the diagnostic tool. 
�z Trigger the GEM active command HORN ON and OFF. 
�z Did the horn sound and turn off?  Yes 
GO to 
E5  . 
No

Page 3861 of 4378

FORD MUSTANG 2003  Workshop Manual �z
Is the resistance less than 5 ohms?  E9 CHECK THE HORN FOR NORMAL OPERATION 
�z
Depress the steering wheel horn switch. 
�z Did the horn sound?  Yes 
INSTALL a new GEM. For 
additional information,

Page 3862 of 4378

FORD MUSTANG 2003  Workshop Manual 1032 (WH/BK), harness side and parking lamp relay Pin 1, 
Circuit 1032 (WH/BK), harness side. 
�z Is the resistance less than 5 ohms?  GO to 
E13  . 
No 
REPAIR Circuit 1032 
(WH/BK). REPEAT the 
self

Page 3863 of 4378

FORD MUSTANG 2003  Workshop Manual GENERAL PROCEDURES 
Programming —Keyless Entry Remote Transmitter 
NOTE:  All keyless entry remote transmitters (15K601) must be programmed at the same time. 
NOTE:  All previous transmitter identif

Page 3864 of 4378

FORD MUSTANG 2003  Workshop Manual REMOVAL AND INSTALLATION 
Actuator 
Removal and Installation 
For additional information, refer to 
Section 501 - 14A  . 
SECTION 501-
14B: Keyless Entry/Computer Operated Locks  2003 Mustang Workshop