Ford 2003 Mustang Workshop Manual page 3715

Inspection and Verification
1. Verify the customer concern by operating the system.
2. Visually inspect for obvious signs of mechanical or electrical damage.
Visual Inspection Chart
Mechanical
Power window
regulator
Window run
weatherstrip
Door window glass
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible)
before proceeding to the next step.
4. If the diagnostic tool does not communicate with the vehicle, refer to the diagnostic tool manual.
5. Carry out the DATA LINK DIAGNOSTIC TEST. If the diagnostic tool responds with:
CKT 914, CKT 915 or CKT70 - ALL ECUS NO RESP/NOT EQUIP, refer to
00 .
NO RESP/NOT EQUIP for the generic electronic module (GEM), go to Pinpoint Test A.
NO RESP/NOT EQUIP for the instrument cluster module (ICM), refer to
System passed, retrieve and record the continuous diagnostic trouble codes (DTCs),
erase the continuous DTCs and carry out self-test diagnostics for the GEM or ICM.
6. If the GEM or ICM DTCs retrieved are related to the concern, go to the GEM or ICM Diagnostic
Trouble Code (DTC) Index.
7. If no DTCs related to the concern are retrieved, proceed to the Symptom Chart to continue
diagnostics.
GEM DIAGNOSTIC TROUBLE CODE (DTC) INDEX
DTC Description
B1217 Horn Relay Output Driver
Circuit Failure
B1218 Horn Relay Output Driver
Short to Battery
B1312 Lamp Headlamp Input Circuit
Central junction box (CJB) circuit breaker 43 (20A), fuse 39
(5A) or 23 (15A)
Battery junction box (BJB) fuse HTD BL (40A)
Generic electronic module (GEM)
Window regulator control switch
Window regulator motor
Instrument cluster module (ICM)
Heated rear window relay
Rear window defrost switch
Heated rear window grid
Circuitry
Source
GEM GO to Section 501-14B
GEM GO to Section 501-14B
GEM GO to Section 413-09
Electrical
Action
.
.
.
Section 418-
Section 413-01 .