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sean
sean, Ford Technician
Category: Ford
Satisfied Customers: 3104
Experience:  Ford Master Technician.
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2005 mondeo tdi, renewed battery, but my hazard lights wont

Customer Question

2005 mondeo tdi, renewed battery, but my hazard lights wont go off
Submitted: 2 years ago.
Category: Ford
Expert:  sean replied 2 years ago.

Hello, I hope I can be of assistance.

Do you have the chassis number of the car? So I can obtain the correct wiring details. Does it make any difference if you lock and unlock the car with the remote fob?

Let me know and I'll reply as soon as I'm able to.

Thank you.

Customer: replied 2 years ago.

hello sean


 


vin /chassis wf05xxgbb55j30551, it makes no difference if i unlock the car or even start it up with remote, the hazards stay on intermittently , flickering , even when the engine not running

Expert:  sean replied 2 years ago.

Hello again,

sorry for more questions, do the hazard lights stay on without flashing? Or do they work as you would expect if they were turned on? Or do they come on and stay on but then go on and off again at a different rate to what you would see if they were turned on?

It's quite important as this will determine which way to start diagnosing the concern.

Let me know.

Thank you.

Customer: replied 2 years ago.

Hi


they dont work as normal, they stay on all of the time,and yes at different rates


 


thanks

Expert:  sean replied 2 years ago.

Hello again, below is a diagnostic procedure to assist you with this, I've included wiring connector images at the bottom.

Ignition ON.

2
CHECK the turn signal lamps.

Do the turn signal lamps illuminate continuously?
Yes
GO to
F2
.
No
GO to
F10
.
F2: RULE OUT THE GENERIC ELECTRONIC MODULE
(GEM) AS POSSIBLE CAUSE FOR A SHORT TO BATTERY VOLTAGE

1
Ignition OFF.

2
Disconnect fuse F91 (CJB).

3
Disconnect fuse F24 (BJB).

4
Disconnect fuse F25 (BJB).

5
Disconnect fuse F97 (CJB).

6
Ignition ON.

7
CHECK the turn signal lamps.

Does one or more turn signal lamp illuminate
continuously?
Yes
GO to
F3
.
No
CHECK the generic electronic module (GEM) using WDS, and
INSTALL a new one if necessary. CHECK the operation of the
system.
F3: DETERMINE TYPE OF FAULT

1
Ignition OFF.

2
Connect Fuse F91 (CJB).

3
Connect Fuse F24 (BJB).

4
Connect Fuse F25 (BJB).

5
Connect Fuse F97 (CJB).

6
Ignition ON.

7
DETERMINE type of fault.

Do the left or right-hand turn signal front and side lamps
illuminate continuously?
Yes
LOCATE and RECTIFY the short to battery voltage in the
circuits connected to soldered connection S371 (left) or S373 (right) using the
Wiring Diagrams. CHECK the operation of the system.
No
- One rear turn signal lamp lit permanently, vehicle without
trailer socket: LOCATE and RECTIFY the short to battery voltage in the circuits
between the generic electronic module (GEM) and the left or right-hand rear lamp
assembly using the Wiring Diagrams. CHECK the operation of the system.
- Both turn signal rear lamps illuminate continuously,
vehicles with trailer socket: VISUALLY CHECK the trailer switch interface (SI)
module and RENEW as necessary. CHECK the operation of the system.
- The left hand rear turn signal lamp illuminates
continuously, vehicles with trailer socket: GO to F4.
- The right-hand rear turn signal lamp illuminates
continuously, vehicles with trailer socket: GO to F6.
- The left-hand turn signal warning lamp in the instrument
cluster illuminates continuously: GO to F8.
- The right-hand turn signal warning lamp in the instrument
cluster illuminates continuously: GO to F9.
F4: CHECK THE TRAILER SWITCH INTERFACE (SI)
MODULE

1
Ignition OFF.

2
Disconnect trailer switch interface (SI) module from
connector C2002.

3
Ignition ON.

4
CHECK the turn signal lamp.

Is the turn signal lamp permanently switched on?
Yes
LOCATE and RECTIFY the short to battery voltage in circuit
(GN/WH) or 15S-LG12 (GN/YE), between the trailer switch interface (SI) module
and the rear lamp assembly using the Wiring Diagrams. CHECK the operation of the
system.
No
GO to
F5
.
F5: CHECK THE TRAILER SWITCH INTERFACE (SI)
MODULE


Click to resize E0031058


1
Measure the voltage between the trailer switch
interface (SI) module, connector C2002, pin 5, circuit (WH), wiring harness side
and ground.

Is battery voltage measured?
Yes
LOCATE and RECTIFY the short to battery voltage in circuit
(WH) or 49-LG12 (BU), connected to trailer switch interface (SI) module,
connector C2002, pin 5, using the Wiring Diagrams. CHECK the operation of the
system.
No
VISUALLY CHECK the trailer switch interface (SI) module and
RENEW as necessary. CHECK the operation of the system.
F6: CHECK THE TRAILER SWITCH INTERFACE (SI)
MODULE

1
Ignition OFF.

2
Disconnect trailer switch interface (SI) module from
connector C2002.

3
Ignition ON.

4
CHECK the turn signal lamp.

Is the turn signal lamp permanently switched on?
Yes
LOCATE and RECTIFY the short to battery voltage in circuit
(GN/YE) or 15S-LG12 (GN/YE), between trailer switch interface (SI) module and
the rear lamp assembly using the Wiring Diagrams. CHECK the operation of the
system.
No
GO to
F7
.
F7: CHECK THE TRAILER SWITCH INTERFACE (SI)
MODULE


Click to resize E0031094


1
Measure the voltage between the trailer switch
interface (SI) module, connector C2002, pin 6, circuit (GN/RD), wiring harness
side and ground.

Is battery voltage measured?
Yes
LOCATE and RECTIFY the short to battery voltage in circuit
(GN/RD) or 49-LG19 (BU/RD), connected to trailer switch interface (SI) module,
connector C2002, pin 6, using the Wiring Diagrams. CHECK the operation of the
system.
No
VISUALLY CHECK the trailer switch interface (SI) module and
RENEW as necessary. CHECK the operation of the system.
F8: CHECK CONTROL CIRCUIT OF LEFT-HAND TURN
SIGNAL LAMP FOR SHORT TO BATTERY VOLTAGE

1
Ignition OFF.

2
Disconnect instrument cluster from connector
C449.

3
Ignition ON.


Click to resize E0022579


4
Measure the voltage between the generic electronic
module (GEM), connector C429, pin 3, circuit 49-LG15 (BU/BK), wiring harness
side and ground.

Is battery voltage measured?
Yes
LOCATE and RECTIFY the short to battery voltage in the
circuit between the generic electronic module (GEM) and the instrument cluster
using the Wiring Diagrams. CHECK the operation of the system.
No
CHECK the instrument cluster using WDS, RENEW if necessary.
CHECK the operation of the system.
F9: CHECK CONTROL CIRCUIT OF RIGHT-HAND TURN
SIGNAL LAMP FOR SHORT TO BATTERY VOLTAGE

1
Ignition OFF.

2
Disconnect instrument cluster from connector
C449.

3
Ignition ON.


Click to resize E0022580


4
Measure the voltage between the generic electronic
module (GEM), connector C429, pin 2, circuit 49-LG22 (BU/YE), wiring harness
side and ground.

Is battery voltage measured?
Yes
LOCATE and RECTIFY the short to battery voltage in the
circuit between the generic electronic module (GEM) and the instrument cluster
using the Wiring Diagrams. CHECK the operation of the system.
No
CHECK the instrument cluster using WDS, RENEW if necessary.
CHECK the operation of the system.
F10: DETERMINE TYPE OF FAULT

1
DETERMINE type of fault.

Do all turn signal lamps flash continuously?
Yes
GO to
F11
.
No
- Left-hand turn signal lamps flash continuously: GO to F14.
- Right-hand turn signal lamps flash continuously: GO to F16.
- Do the left or right-hand turn signal front and side lamps
flash continuously? RENEW the generic electronic module (GEM). CHECK the
operation of the system.
- The left or right-hand rear turn signal lamp flashes
continuously: RENEW the generic electronic module (GEM). CHECK the operation of
the system.
- The left or right-hand turn signal warning lamp in the
instrument cluster flashes continuously: GO to F18.
F11: CHECK THE CONTROL CIRCUIT OF THE HAZARD
WARNING LIGHTS FOR SHORT TO GROUND

1
Ignition OFF.

2
Disconnect Generic electronic module (GEM) from
connector C429.


Click to resize E0031097


3
Measure the resistance between the generic electronic
module (GEM), connector C429, pin 23:

  • Vehicles built before 06/2003: circuit 91S-LG8 (BK/OG), wiring harness side
    and ground.


  • Vehicles built from 06/2003: circuit 31S-LG8 (BK/OG), wiring harness side
    and ground.

Is the resistance greater than 10,000 Ohms?
Yes
RENEW the generic electronic module (GEM). CHECK the
operation of the system.
No
- Vehicles built up to 04/2005: GO to F12.
- Vehicles built from 04/2005: GO to F13.
F12: CHECK THE HAZARD WARNING LIGHT
SWITCH

1
Disconnect Hazard warning lamp switch from.

  • Vehicles built before 06/2003: connector C438


  • Vehicles built from 06/2003: connector C1019


Click to resize E0031097


2
Measure the resistance between the generic electronic
module (GEM), connector C429, pin 23:

  • Vehicles built before 06/2003: circuit 91S-LG8 (BK/OG), wiring harness side
    and ground.


  • Vehicles built from 06/2003: circuit 31S-LG8 (BK/OG), wiring harness side
    and ground.

Is the resistance greater than 10,000 Ohms?
Yes
RENEW the hazard warning light switch. CHECK the operation
of the system.
No
RECTIFY the short to ground in circuit 91S-LG8 (BK/OG) or
31S-LG8 (BK/OG), between the generic electronic module (GEM) and the hazard
warning light switch using the Wiring Diagrams. CHECK the operation of the
system.
F13: CHECK THE HAZARD WARNING LIGHT
SWITCH

1
Disconnect Hazard warning light switch from connector
C438.


Click to resize E0031097


2
Measure the resistance between the generic electronic
module (GEM), connector C429, pin 23, circuit 31S-LG8 (BK/OG), wiring harness
side and ground.

Is the resistance greater than 10,000 Ohms?
Yes
RENEW the hazard warning light switch. CHECK the operation
of the system.
No
LOCATE and RECTIFY the short to ground in the circuit
between the generic electronic module (GEM) and the hazard warning light switch
using the Wiring Diagrams. CHECK the operation of the system.
F14: CHECK CONTROL CIRCUIT OF LEFT-HAND TURN
SIGNAL LAMP FOR SHORT TO GROUND

1
Ignition OFF.

2
Disconnect Generic electronic module (GEM) from
connector C429.


Click to resize E0031098


3
Measure the resistance between the generic electronic
module (GEM), connector C429, pin 17, circuit 91S-LG27B (BK/GN), wiring harness
side and ground.

Is the resistance greater than 10,000 Ohms?
Yes
RENEW the generic electronic module (GEM). CHECK the
operation of the system.
No
GO to
F15
.
F15: CHECK THE TURN SIGNAL
SWITCH

1
Disconnect Turn signal switch from connector
C529.


Click to resize E0031098


2
Measure the resistance between the generic electronic
module (GEM), connector C429, pin 17, circuit 91S-LG27B (BK/GN), wiring harness
side and ground.

Is the resistance greater than 10000 Ohms?
Yes
RENEW the turn signal switch. CHECK the operation of the
system.
No
LOCATE and RECTIFY the short to ground in the circuit
between the generic electronic module (GEM) and the turn signal switch using the
Wiring Diagrams. CHECK the operation of the system.
F16: CHECK CONTROL CIRCUIT OF RIGHT-HAND TURN
SIGNAL LAMP FOR SHORT TO GROUND

1
Ignition OFF.

2
Disconnect Generic electronic module (GEM) from
connector C429.


Click to resize E0031099


3
Measure the resistance between the generic electronic
module (GEM), connector C429, pin 19, circuit 91S-LG27A (BK/GN), wiring harness
side and ground.

Is the resistance greater than 10,000 Ohms?
Yes
RENEW the generic electronic module (GEM). CHECK the
operation of the system.
No
GO to
F17
.
F17: CHECK THE TURN SIGNAL
SWITCH

1
Disconnect Turn signal switch from connector
C529.


Click to resize E0031099


2
Measure the resistance between the generic electronic
module (GEM), connector C429, pin 19, circuit 91S-LG27A (BK/GN), wiring harness
side and ground.

Is the resistance greater than 10000 Ohms?
Yes
RENEW the turn signal switch. CHECK the operation of the
system.
No
LOCATE and RECTIFY the short to ground in the circuit
between the generic electronic module (GEM) and the turn signal switch using the
Wiring Diagrams. CHECK the operation of the system.
F18: CHECK THE INSTRUMENT
CLUSTER

1
Ignition OFF.

2
Disconnect Generic electronic module (GEM) from
connector C429.

3
Ignition ON.

4
CHECK the warning lamp in the instrument
cluster.

Does the left or right-hand turn signal warning lamp flash
continuously?
Yes
CHECK the instrument cluster using WDS, RENEW if necessary.
CHECK the operation of the system.
No
RENEW the generic electronic module (GEM). CHECK the
operation of the
system.

Below are the wiring connectors for the GEM and indicator switch.

graphic

graphic

graphic

graphic

graphic

graphic

graphic

Let me know if I can assist further.

Best wishes,

Sean.

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