Door FORD MUSTANG 2003 Service Manual

GEM Diagnostic Trouble Code (DTC) Index
DTC Description Source Action
B1218 Horn Relay Coil Circuit Short to
VBatt GEM REFER to
Section 501 - 14B .
B1312 Lamp Headlamp Input Circuit
Short to Battery GEM REFER to
Section 413 - 09 .
B1317 Battery Voltage High GEM REFER to
Section 414 - 00 .
B1318 Battery Voltage Low GEM REFER to
Section 414 - 00 .
B1322 Driver Door Ajar Circuit Short to
Ground GEM REFER to
Section 417 - 02 .
B1330 Passenger Door Ajar Circuit
Short to Ground GEM REFER to
Section 417 - 02 .
B1334 Decklid Ajar Rear Door Circuit
Short to Ground GEM REFER to
Section 417 - 02 .
B1339 Chime Input Request Circuit
Short to Battery GEM REFER to
Section 413 - 09 .
B1340 Chime Input Request Circuit
Short to Ground GEM REFER to
Section 413 - 09 .
B1342 ECU is Defective GEM Clear the DTCs. Retrieve the DTCs. If DTC B1342
is retrieved, INSTALL a new GEM. REFER to Section 419 - 10 .
B1353 Ignition Key-
In Circuit Open GEM REFER to
Section 413 - 09 .
B1359 Ignition Run/Acc Circuit Failure GEM REFER to
Section 211 - 05 .
B1396 Power Door Lock Circuit Short
to Battery GEM REFER to
Section 501 - 14B .
B1397 Power Door Unlock Circuit
Short to Battery GEM REFER to
Section 501 - 14B .
B1405 Driver Power Window Down
Circuit Short to Battery GEM REFER to
Section 501 - 11 .
B1408 Driver Power Window Up
Circuit Short to Battery GEM REFER to
Section 501 - 11 .
B1426 Lamp Safety Belt Circuit Short
to Battery GEM Go To Pinpoint Test K .
B1428 Lamp Safety Belt Circuit Failure GEM Go To Pinpoint Test K .
B1431 Wiper Brake/Run Relay Circuit
Failure GEM REFER to
Section 501 - 16 .
B1432 Wiper Brake/Run Relay Circuit
Short to Battery GEM REFER to
Section 501 - 16 .
B1434 Wiper Hi/Low Speed Relay Coil
Circuit Failure GEM REFER to
Section 501 - 16 .
B1436 Wiper Hi/Low Speed Relay Coil
Circuit Short to Battery GEM REFER to
Section 501 - 16 .
B1438 Wiper Mode Select Switch
Circuit Failure GEM REFER to
Section 501 - 16 .
B1441 Wiper Mode Select Switch
Circuit Short to Ground GEM REFER to
Section 501 - 16 . Klj . 8 ba
412003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

DESCRIPTION AND OPERATION
Warning Devices
The warning device system consists of the following components:
zdoor ajar switches
z generic electronic module (GEM)
z key- in-ignition warning switch
z safety belt switch
z parklamp switch
SECTION 413-
09: Warning Devices 2003 Mustang Workshop Manual Klj . 1 ba
12003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

DIAGNOSIS AND TESTING
Gauges And Warning Devices
Refer to Wiring Diagrams Cell
59 , Generic Electronic Module for schematic and connector
information.
Refer to Wiring Diagrams Cell 60 , Instrument Cluster for schematic and connector information.
Refer to Wiring Diagrams Cell 66 , Warning Chime for schematic and connector information.
Principles of Operation
Key- In-Ignition Warning Chime
The key- in-ignition warning chime activates when the generic electronic module (GEM) detects the
ignition switch circuits are in the OFF or ACC states and when the GEM detects the driver door is ajar
from the driver door ajar circuits. Refer to the Chime Duration Table in this section for audible output,
duration time, and priority ratings.
Airbag Warning Chime
The airbag warning chime activates when the GEM detects the ignition switch circuits are in the RUN
state and when the GEM detects a chime is requested from the airbag system circuit. Refer to the
Chime Duration Table for audible output, duration time, and priority ratings.
Door Ajar Warning Chime
The door ajar warning chime activates when the GEM detects the ignition switch circuits are in the
RUN state and when the GEM detects the driver or passenger door is ajar from the driver and
passenger door ajar circuits. Refer to the Chime Duration Table in this section for audible output,
duration time, and priority ratings.
Headlamps Left on Warning Chime
The headlamps left on warning chime activates when the GEM detects the ignition switch circuits are
in the KEYOUT state, when the GEM detects the driver door is ajar from the driver door ajar circuit, SECTION 413-
09: Warning Devices 2003 Mustang Workshop Manual Special Tool(s)
73III Automotive Meter
105-
R0057 or equivalent Worldwide Diagnostic System
(WDS)
418-
F224,
New Generation STAR (NGS)
Tester
418- F048, or equivalent
diagnostic tool Klj . 1 ba
202003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

and when the GEM detects the headlamps or parklamps are on from the exterior lamp circuits. Refer
to the Chime Duration Table in this section for audible output, duration time, and priority ratings.
Safety Belt Warning Chime
The safety belt warning chime and safety belt warning lamp activate when the GEM detects the
ignition switch circuits are in the RUN or START state and when the GEM detects the safety belt is
unbuckled from the safety belt circuit. The safety belt warning lamp indicator will prove out for three
seconds whenever the GEM detects that the ignition circuits make a transition to RUN from OFF, ACC,
or KEYOUT state. Refer to the Chime Duration Table in this section for audible output, duration time,
and priority ratings.
Belt Minder
NOTE:
Belt minder is a configurable item. If configuring using a diagnostic tool, refer to Section 418 -
01 . To configure without using a diagnostic tool, refer to
Belt Minder Deactivating/Activating in this
section.
The belt minder feature supplements the current safety belt warning function. The belt minder feature
is enabled after the current safety belt warning is complete. If the driver safety belt is not buckled
approximately five seconds after the safety belt warning light has turned off, the belt minder reminds
the driver that their safety belt is unbuckled by intermittently sound a chime and illuminating the safety
belt warning lamp in the instrument cluster. While activated, the belt minder alternates the chime and
indicator from on for six seconds to off for 30 seconds.
The belt minder reminder stops when:
zthe drive seat belt is buckled.
z the ignition is turned to OFF or ACC.
z five minutes have elapsed since belt minder has started.
Inspection and Verification
NOTE: Upon installation of a new GEM, the module must be reconfigured. For additional information,
refer to Section 418 - 01 .
1. The warning lamps are a GEM controlled system; refer to Section 419 - 10 .
2. Verify the customer concern by operating the system in question.
3. Visually inspect for the following obvious signs of mechanical and electrical damage.
Chime Duration Table Feature Audible Output Duration Priority
Safety belt Chime, 60/minute 740 Hz 6.0 seconds 1
Key-
in-ignition Chime, 120/minute 740 Hz Continuous 2
Headlamps left on Chime, 240/minute 740 Hz Continuous 3
Airbag Single tone, 1,000 Hz Continuous 4
Door ajar Single tone, 1,000 Hz 1.0 second 7 Klj . 2 ba
202003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

Symptom Chart
Symptom Chart Condition
Possible Sources Action
z No communication with the
generic electronic module
(GEM) z
Central junction box
(CJB) fuses:
„39 (5A).
„ 32 (15A).
z Circuitry.
z Generic electronic
module (GEM). z
Go To Pinpoint Test
A .
z The key- in-ignition chime does
not operate correctly z
Central junction box
(CJB) fuses:
„28 (15A).
„ 32 (15A).
z Central junction box
(CJB).
z Driver door ajar
switch.
z Key- in ignition
switch.
z Circuitry.
z Generic electronic
module (GEM).
z Ignition switch. z
Go To Pinpoint Test
B .
z A chime does not operate
correctly— air bag z
Restraint control
module (RCM).
z Circuitry.
z Generic electronic
module (GEM).
z Ignition switch. z
Go To Pinpoint Test
C .
z The door ajar chime does not
operate correctly z
Driver door ajar
switch.
z Passenger door ajar
switch.
z Circuitry.
z Generic electronic
module (GEM).
z Ignition switch. z
Go To Pinpoint Test
D .
z The headlamp on reminder
chime does not operate
correctly z
Headlamp switch .
z Circuitry.
z Generic electronic
module (GEM).
z Driver door ajar
switch.
z Ignition switch. z
Go To Pinpoint Test
E .
z The safety belt warning chime
does not operate correctly z
Circuitry.
z Safety belt switch.
z Generic electronic
module (GEM).
z Ignition switch. z
Go To Pinpoint Test
F .
z The belt minder feature does
not operate correctly z
Circuitry.
z Safety belt switch.
z Generic electronic
module (GEM).
z Ignition switch. z
Go To Pinpoint Test
F . Klj . 4 ba
202003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

PINPOINT TEST B: THE KEY-
IN-IGNITION CHIME DOES NOT
OPERATE CORRECTLY z
Is the resistance less than 5 ohms? A3 CHECK CIRCUIT 397 (BK/WH) FOR SHORT TO POWER
z
Measure the voltage between the GEM C201b pin 4, circuit
397 (BK/WH), harness side and ground.
z Is any voltage present? Yes
REPAIR the circuit. TEST
the system for normal
operation.
No
REFER to
Section 418 - 00 .
Test Step Result / Action to Take
B1 CHECK IGNITION STATES
z
Connect the diagnostic tool.
z Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
z Monitor the GEM PIDS IGN_KEY, IGN_A, IGN_S, and IGN_R
while cycling the ignition switch through the OFF, ACC, RUN,
START and key out positions.
z Do the PID values agree with the ignition switch states? Yes
GO to
B2 .
No
GO to B4 .
B2 CHECK GEM INTERNAL TONE OPERATION
z
Enter the following diagnostic mode on the diagnostic tool:
GEM Active Command.
z Trigger the GEM Active Command CHIME ON and OFF.
z Does the chime operate correctly? Yes
GO to
B3 .
No
GO to B11 .
B3 CHECK GEM INPUT FROM DOOR AJAR CIRCUIT
z
Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
z Monitor the GEM PID D_DR_SW, while opening and closing
the driver door.
z Do the GEM PID D_DR_SW values indicate CLOSED and
AJAR correctly? Yes
GO to
B11 .
No
Go To Pinpoint Test D .
B4 CHECK GEM INPUT VOLTAGE FROM IGNITION SWITCH AT Klj . 6 ba
202003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

PINPOINT TEST D: THE DOOR AJAR CHIME DOES NOT OPERATE
CORRECTLY z
Is the resistance less than 5 ohms? C8 CHECK FOR CORRECT MODULE OPERATION
z
Check:
zfor corrosion
z for pushed- out pins
z connector seated correctly
z Connect any disconnected connectors.
z Make sure all other system connectors are fully seated.
z Operate the system and verify the concern is still present.
z Is the concern still present? Yes
INSTALL a new GEM.
REFER to
Section 419 - 10 .
CLEAR the DTCs. REPEAT
the GEM self- test.
No
The system is operating
correctly at this time.
Concern may have been
caused by a loose or
corroded connector. CLEAR
the DTCs. REPEAT the self-
test. Test Step Result / Action to Take
D1 CHECK IGNITION STATES
z
Connect the diagnostic tool.
z Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
z Monitor the GEM PIDS IGN_KEY, IGN_A, IGN_S, and
IGN_R while cycling the ignition switch through the OFF,
ACC, RUN, START and key out positions.
z Do the PID values agree with the ignition switch states? Yes
GO to
D2 .
No
GO to Pinpoint Test B .
D2 CHECK GEM INTERNAL TONE OPERATION
z
Enter the following diagnostic mode on the diagnostic tool:
GEM Active Command.
z Trigger the GEM active command CHIME ON and OFF.
z Does the chime operate correctly? Yes
GO to
D3 .
No
GO to D17 .
D3 CHECK GEM INPUT —
DRIVER DOOR AJAR CIRCUIT z
Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
z Monitor the GEM PID D_DR_SW while opening and closing
the driver door.
z Do the GEM PID D_DR_SW values indicate CLOSED and
AJAR correctly? Yes
GO to
D4 .
No
GO to D5 .
D4 CHECK GEM INPUT —
PASSENGER DOOR AJAR CIRCUIT Klj . 11 ba
202003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

z
Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
z Monitor the GEM PID P_DR_SW while opening and closing
the passenger door.
z Do the GEM PID P_DR_SW values indicate CLOSED and
AJAR correctly? Yes
GO to
D17 .
No
GO to D11 .
D5 CHECK CIRCUIT 765 (YE/BK) AND DRIVER DOOR AJAR
SWITCH FOR OPEN OR SHORT TO GROUND z
Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
z Monitor the GEM PID D_DR_SW while opening and closing
the driver door.
z Does the GEM PID D_DR_SW value indicate AJAR with
driver door closed? Yes
GO to
D6 .
No
GO to D8 .
D6 ISOLATE SHORT TO GROUND ON CIRCUIT 765 (YE/BK)
z
Disconnect: Driver Door Ajar Switch C526.
z Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
z Monitor the GEM PID D_DR_SW.
z Does GEM PID D_DR_SW read CLOSED? Yes
INSTALL a new driver door
ajar switch. REFER to
Section 501
- 14A . REPEAT
the self- test. CLEAR the
DTCs.
No
GO to D7 .
D7 CHECK CIRCUIT 765 (YE/BK) FOR SHORT TO GROUND
BETWEEN GEM AND DRIVER DOOR AJAR SWITCH z
Disconnect: GEM C201c.
z Measure the resistance between GEM C201c pin 13, circuit
765 (YE/BK), harness side and ground.
z Is the resistance greater than 10,000 ohms? Yes
GO to
D17 .
No
REPAIR the circuit.
REPEAT the self- test.
CLEAR the DTCs. D8 CHECK CIRCUIT 765 (YE/BK) FOR OPEN
z
Disconnect: Driver Door Ajar Switch C526.
z Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
z Connect a 10A fused jumper wire between driver door ajar
switch C526 pin 2, circuit 765 (YE/BK), harness side and
ground while monitoring GEM PID D_DOOR. Yes
GO to
D10 .
No
GO to D9 . Klj . 12 ba
202003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

z
Does GEM PID D_DR_SW indicate AJAR with jumper
wire installed? D9 CHECK CIRCUIT 765 (YE/BK) FOR OPEN BETWEEN GEM
AND DRIVER DOOR AJAR SWITCH z
Disconnect: GEM C201c.
z Measure the resistance between GEM C201c pin 13, circuit
765 (YE/BK), harness side and driver door ajar switch C526
pin 2, circuit 765 (YE/BK), harness side.
z Is the resistance less than 5 ohms? Yes
GO to
D17 .
No
REPAIR the circuit.
REPEAT the self- test.
CLEAR the DTCs. D10 CHECK CIRCUIT 1205 (BK) FOR OPEN BETWEEN
DRIVER DOOR AJAR SWITCH AND GROUND z
Disconnect: Driver Door Ajar Switch C526.
z Measure the resistance between driver door ajar switch
C526 pin 1, circuit 1205 (BK), harness side and ground.
z Is the resistance less than 5 ohms? Yes
INSTALL a new driver door
ajar switch. REFER to
Section 501
- 14A . REPEAT
the self- test. CLEAR the
DTCs.
No
REPAIR the circuit.
REPEAT the self- test.
CLEAR the DTCs. D11 ISOLATE OPEN OR SHORT TO GROUND ON CIRCUIT
761 (GN/RD) z
Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
z Monitor the GEM PID P_DR_SW, while opening and closing
the passenger door.
z Does the GEM PID P_DR_SW value indicate AJAR with
the passenger door closed? Yes
GO to
D12 .
No
GO to D14 .
D12 ISOLATE SHORT TO GROUND ON CIRCUIT 761 (GN/RD) Klj . 13 ba
202003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

z
Disconnect: Passenger Door Ajar Switch C602.
z Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
z Monitor the GEM PID P_DR_SW.
z Does GEM PID P_DR_SW read CLOSED? Yes
INSTALL a new passenger
door ajar switch. REFER to
Section 501
- 14A . REPEAT
the self- test. CLEAR the
DTCs.
No
GO to D13 .
D13 CHECK CIRCUIT 761 (GN/RD) FOR SHORT TO GROUND
BETWEEN GEM AND PASSENGER DOOR AJAR SWITCH z
Disconnect: GEM C201c.
z Measure the resistance between GEM C201c pin 5, circuit
761 (GN/RD), harness side and ground.
z Is the resistance greater than 10,000 ohms? Yes
GO to
D17 .
No
REPAIR the circuit.
REPEAT the self- test.
CLEAR the DTCs. D14 ISOLATE OPEN CIRCUIT 761 (GN/RD)
z
Disconnect: Passenger Door Ajar Switch C602.
z Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
z Connect a 10A fused jumper wire between the passenger
door ajar switch C602 pin 2, circuit 761 (GN/RD), harness
side and ground while monitoring the GEM PID P_DR_SW.
z Does GEM PID P_DR_SW read AJAR with jumper wire
installed? Yes
GO to
D16 .
No
GO to D15 .
D15 CHECK FOR OPEN ON CIRCUIT 761 (GN/RD) BETWEEN
GEM AND PASSENGER DOOR AJAR SWITCH z
Disconnect: GEM C201c.
z Measure the resistance between GEM C201c pin 5, circuit
761 (GN/RD), harness side and passenger door ajar switch
C602 pin 2, circuit 761 (GN/RD), harness side. Yes
GO to
D17 .
No
REPAIR the circuit.
REPEAT the self- test.
CLEAR the DTCs. Klj . 14 ba
202003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...