ford Workshop Repair Guides

Ford Workshop Service and Repair Manuals

417-04 Daytime Running Lamps (DRL) > < Interior Lighting - Vehicles Built Up To: 08-2001
Interior Lighting - Interior Lighting—Vehicles Built From: 08/2001 Focus RS 2003 (09/2002-)
Diagnosis and Testing

Refer to Wiring Diagrams Section 417-02, for schematic and connector information.

Inspection and Verification

  1. Verify the customer concern by operating the system.
  1. Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection Chart

Electrical
  • Fuse(s)
  • Bulb(s)
  • Wiring harness
  • Electrical connector(s)
  • Switch(es)
  • Lamp(s)
  • Battery saver relay
  • Central junction box (CJB)
  • Generic electronic module (GEM)
  1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  1. If the cause is not visually evident, connect the diagnostic tool to the data link connector (DLC).
  1. Retrieve the Diagnostic Trouble Code (DTC)s.
  1. If the DTCs retrieved are related to the concern, refer to the Diagnostic Trouble Code (DTC) Index Chart.
  1. If no DTCs related to the concern are retrieved, verify the symptom and refer to the Symptom Chart.
  1. If DTCs are retrieved which are not found in the Diagnostic Trouble Code (DTC) Index Chart, REFER to Section  419-10 Multifunction Electronic Modules.

Diagnostic Trouble Code (DTC) Index Chart

Diagnostic Trouble Code (DTC) Index Chart

DTC Description Source Action
B1315 Battery saver relay coil circuit short to battery GEM GO to Pinpoint Test A.
B1316 Battery saver relay coil circuit short to ground GEM GO to Pinpoint Test A.
B1319 Driver door ajar circuit failure GEM GO to Pinpoint Test A.
B1325 Door ajar lamp circuit short to battery GEM GO to Pinpoint Test A.
B1326 Door ajar lamp circuit short to ground GEM GO to Pinpoint Test A.
B1327 Passenger door ajar circuit failure GEM GO to Pinpoint Test A.
B1331 Luggage compartment lid ajar circuit failure GEM GO to Pinpoint Test C.
B1335 Door ajar RR circuit failure GEM GO to Pinpoint Test A.
B1571 Door ajar LR circuit failure GEM GO to Pinpoint Test A.
B2555 Interior lamp output circuit short to battery GEM GO to Pinpoint Test A.

Symptom Chart

Symptom Chart

Symptom Possible Sources Action
The front interior lamp is inoperative
*
Circuit.
*
Interior lamp switch.
*
Front interior lamp.
*
Battery saver relay.
*
GEM.
*
GO to Pinpoint Test A.
The rear interior lamp is inoperative
*
Circuit.
*
Rear interior lamp.
*
GO to Pinpoint Test B.
The luggage compartment lamp is inoperative
*
Circuit.
*
Luggage compartment lamp.
*
Luggage compartment lamp switch.
*
GO to Pinpoint Test C.
The map reading lamp is inoperative
*
Circuit.
*
Front interior lamp.
*
GO to Pinpoint Test D.
The illuminated entry is inoperative when using the remote transmitter
*
Circuit.
*
GEM.
*
The vanity mirror illumination is inoperative
*
Circuit.
*
Vanity mirror lamp.
*
GO to Pinpoint Test E.
The glove compartment illumination is inoperative
*
Circuit.
*
Glove compartment lamp.
*
GO to Pinpoint Test F.
The footwell lamp is inoperative
*
Circuit.
*
Footwell lamp.
*
GO to Pinpoint Test G.

Pinpoint Tests

NOTE:
NOTE:Use a digital multimeter for all electrical measurements.

PINPOINT TEST A : THE FRONT INTERIOR LAMP IS INOPERATIVE

TEST CONDITIONS DETAILS/RESULTS/ACTIONS
A1: VERIFY THE CONCERN
1
Check for operation of the interior lamp in both the ON and 12 SEC positions.

Is the interior lamp inoperative in both positions?
Yes
No
If inoperative in the 12 SEC position, GO to A2.
If inoperative in the ON position, GO to A13.
A2: CHECK INPUT FROM THE INTERIOR LAMP SWITCHES
NOTE:
NOTE:Make sure that the front interior lamp switch is in the 12 SEC position.
1
Check for operation of the illuminated entry from all doors.

Is illuminated entry inoperative from only one door?
Yes
If driver door interior lamp switch inoperative, GO to A3.
If any other door interior lamp switch inoperative, GO to A6.
No
A3: CHECK THE DRIVER DOOR INTERIOR LAMP SWITCH SIGNAL TO MODULE
1
Disconnect GEM C104.

2
Measure the resistance between the GEM C104 pin 22, circuit 31S-GL9 (BK/YE) (LHD) or circuit 31S-GL16 (BK/BU) harness side and ground. Note the reading with the door interior lamp switch pressed (door open) as well as released (door closed).

Is the resistance less than 5 ohms (door closed) and greater than 10,000 ohms (door open)?
Yes
INSTALL a new GEM. TEST the system for normal operation.
No
A4: CHECK THE DRIVER DOOR PIN CIRCUIT FOR OPEN
1
Disconnect Driver Interior Lamp Switch C685 (LHD), C684 (RHD).

2
Measure the resistance between interior lamp switch C685 pin 1, (LHD) or C684 pin 1, (RHD), harness side and the GEM C104 pin 22, circuit 31S-GL9 (BK/YE) (LHD) or circuit 31S-GL16 (BK/BU), harness side.

Is the resistance less than 5 ohms?
Yes
No
REPAIR circuit 31S-GL9 (BK/YE) for LHD or circuit 31S-GL16 (BK/BU) for RHD. TEST the system for normal operation.
A5: CHECK GROUND CIRCUIT TO DRIVER DOOR INTERIOR LAMP SWITCH FOR OPEN

1
Measure the resistance between interior lamp switch C685 pin 2, circuit 31-GL9 (BK) (LHD) or C684 pin 2, circuit 31-GL16 (BK) (RHD) harness side and ground.

Is the resistance less than 5 ohms?
Yes
INSTALL a new driver door interior lamp switch. TEST the system for normal operation.
No
REPAIR circuit 31-GL9 (BK) for LHD or circuit 31-GL16 (BK) for RHD. TEST the system for normal operation.
A6: CHECK THE DOOR INTERIOR LAMP SWITCH SIGNAL(S) TO THE GEM
1
Disconnect GEM C101, GEM C102.

2
Measure the resistance between the GEM C101 pin 18 and GEM C102 pin 15, harness side and ground. Note the reading with the door interior lamp switch(s) pressed (door closed) as well as released (door open).

Is the resistance less than 5 ohms (door open) and greater than 10,000 ohms (door closed)?
Yes
INSTALL a new GEM. TEST the system for normal operation.
No
A7: CHECK THE DOOR INTERIOR LAMP CIRCUIT(S) FOR OPEN
1
Disconnect Interior Lamp Switches C686, C687, C684 and C685.

2
Measure the resistance between:
  • the GEM C101 pin 18, circuit 31S-GL19 (BK/GN) and the interior lamp switch C686 pin 1, circuit 31S-GL19 (BK/GN) (rear right) harness side.
  • the GEM C102 pin 15, circuit 31S-GL12 (BK/OG) and the interior lamp switch C687 pin 1, circuit 31S-GL12 (BK/OG) (rear left) harness side.
  • the GEM C104 pin 21, circuit 31S-GL16 (BK/BU) (LHD front passenger) and the interior lamp switch C684 pin 1, circuit 31S-GL16 (BK/BU) harness side.
  • the GEM C104 pin 21, circuit 31S-GL9 (BK/YE) (RHD front passenger) and the interior lamp switch C685 pin 1, circuit 31S-GL9 (BK/YE) harness side.

Is the resistance less than 5 ohms?
Yes
No
For rear doors, REPAIR circuit 31S-GL19 (BK/GN) (right rear) or circuit 31S-GL12 (BK/OG) (left rear). For front passenger doors, REPAIR circuit 31S-GL16 (BK/BU) (LHD) or circuit 31S-GL9 (BK/YE) (RHD). TEST the system for normal operation.
A8: CHECK GROUND CIRCUIT TO DOOR INTERIOR LAMP SWITCH FOR OPEN

1
Measure the resistance between interior lamp switch C684 pin 2, circuit 31-GL16 (BK) (passenger LHD) or C685 pin 2, circuit 31-GL9 (BK) (passenger RHD), or C686 pin 2, circuit 31-GL19 (BK) (right rear), or C687 pin 2, circuit 31-GL12 (left rear) harness side and ground.

Is the resistance less than 5 ohms?
Yes
No
For rear doors REPAIR circuit 31-GL19 (BK) (right rear) or circuit 31-GL12 (BK) (left rear). For front passenger doors, REPAIR circuit 31-GL16 (BK) (LHD) or circuit 31-GL9 (BK) (RHD). TEST the system for normal operation.
A9: CHECK FRONT INTERIOR LAMP FOR OPEN
1
Disconnect Front Interior Lamp C899.
2
Disconnect Front Interior Lamp C890.
3
Position the front interior lamp switch in the 12 SEC position.

4
Measure the resistance between the front interior lamp C899 pin 1 and front interior lamp C890 pin 1 (component side).

Is the resistance less than 5 ohms?
Yes
No
INSTALL a new front interior lamp. TEST the system for normal operation.
A10: CHECK GROUND CIRCUIT 31-LC7 (BK) TO FRONT INTERIOR LAMP FOR OPEN

1
Measure the resistance between the front interior lamp C890 pin 2, circuit 31-LC7 (BK), harness side and ground.

Is the resistance less than 5 ohms?
Yes
No
REPAIR circuit 31-LC7 (BK). TEST the system for normal operation.
A11: CHECK SWITCHED GROUND CIRCUIT TO FRONT INTERIOR LAMP FOR OPEN
1
Disconnect GEM C101.

2
Measure the resistance between the front interior lamp C890 pin 1, circuit 31S-LC7 (BK/BU), harness side and the GEM C101 pin 3, circuit 31S-LC1 (BK/BU), harness side.

Is the resistance less than 5 ohms?
Yes
INSTALL a new GEM.
No
REPAIR circuit 31S-LC7 (BK/BU) or 31S-LC1 (BK/BU). TEST the system for normal operation.
A12: CHECK CIRCUIT 29-LC7 (OG/BU) FOR VOLTAGE
1
Disconnect Front interior lamp C899.

2
Measure the voltage between the front interior lamp C899 pin 1, circuit 29-LC7 (OG/BU), harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
A13: CHECK CIRCUIT 29-LC7 (OG/BU) FOR OPEN
1
Disconnect Battery Saver Relay.

2
Measure the resistance between the battery saver relay pin 5, and C899 pin 1, circuit 29-LC7 (OG/BU), harness side.

Is the resistance less than 5 ohms?
Yes
No
REPAIR circuit 29-LC7 (OG/BU). TEST the system for normal operation.
A14: CHECK POWER SUPPLY TO THE BATTERY SAVER RELAY

1
Measure the voltage between the battery saver relay pin 3, circuit 30-DA1 (RD), harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
CHECK fuse 35 (7.5A) and fuse 7 (40A), INSTALL new fuse(s) as necessary. If both fuses are OK, REPAIR circuit 30-DA1 (RD). TEST the system for normal operation.
A15: CHECK CONDITION OF BATTERY SAVER RELAY
1
Carry out a component test on the battery saver relay.
REFER to Component Test in this section.

Is the relay OK?
Yes
INSTALL a new GEM. TEST the system for normal operation.
No
INSTALL a new battery saver relay. TEST the system for normal operation.
A16: CHECK GROUND CIRCUIT TO FRONT INTERIOR LAMP
1
Disconnect Front Interior Lamp C890.

2
Measure the resistance between the front interior lamp C890 pin 2, circuit 31-LC7 (BK), harness side and ground.

Is the resistance less than 5 ohms?
Yes
INSTALL a new front interior lamp. TEST the system for normal operation.
No
REPAIR circuit 31-LC7 (BK). TEST the system for normal operation.
A17: CHECK CIRCUIT 29-LC7 (OG/BU) FOR VOLTAGE
1
Disconnect Front Interior Lamp C899.

2
Measure the voltage between the front interior lamp C899 pin 1, circuit 29-LC7 (OG/BU), harness side and ground.

Is the voltage greater than 10 volts?
Yes
INSTALL a new front interior lamp. TEST the system for normal operation.
No
A18: CHECK CIRCUIT 29-LC7 (OG/BU) FOR OPEN
1
Disconnect Battery Saver Relay.

2
Measure the resistance between the battery saver relay pin 5, and the front interior lamp C899 pin 1, circuit 29-LC7 (OG/BU), harness side.

Is the resistance less than 5 ohms?
Yes
No
REPAIR circuit 29-LC7 (OG/BU). TEST the system for normal operation.
A19: CHECK POWER SUPPLY TO THE BATTERY SAVER RELAY

1
Measure the voltage between the battery saver relay pin 3, circuit 30-DA1 (RD), harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
CHECK fuse 35 (7.5A) and fuse 7 (40A), INSTALL new fuse(s) as necessary. If both fuses are OK, REPAIR circuit 30-DA1 (RD). TEST the system for normal operation.
A20: CHECK CONDITION OF BATTERY SAVER RELAY
1
Carry out a component test on the battery saver relay.
REFER to Component Test in this section.

Is the relay OK?
Yes
INSTALL a new GEM. TEST the system for normal operation.
No
INSTALL a new battery saver relay. TEST the system for normal operation.

PINPOINT TEST B : THE REAR INTERIOR LAMP IS INOPERATIVE

TEST CONDITIONS DETAILS/RESULTS/ACTIONS
B1: CHECK OPERATION OF FRONT INTERIOR LAMP
1
Visually inspect the front interior lamp for illumination.

Does the front interior lamp illuminate?
Yes
No
GO to Pinpoint Test A.
B2: CHECK CIRCUIT 29-LC17 (OG/YE) FOR VOLTAGE

1
Measure the voltage between the rear interior lamp C892 pin 1, circuit 29-LC17 (OG/YE), harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
REPAIR circuit 29-LC17 (OG/YE). TEST the system for normal operation.
B3: CHECK THE ON AND 12 SEC OPERATIONS ON THE REAR INTERIOR LAMP
1
Check the rear interior lamp operates in the ON and 12 SEC positions.

Are both settings inoperative?
Yes
INSTALL a new rear interior lamp. TEST the system for normal operation.
No
If ON position is inoperative, GO to B4.
If 12 SEC position is inoperative, GO to B5.
B4: CHECK CIRCUIT 31-LC17 (BK) FOR OPEN
1
Disconnect Rear Interior Lamp C891.

2
Measure the resistance between the rear interior lamp C891 pin 2, circuit 31-LC17 (BK), harness side and ground.

Is the resistance less than 5 ohms?
Yes
INSTALL a new rear interior lamp. TEST the system for normal operation.
No
REPAIR circuit 31-LC17 (BK). TEST the system for normal operation.
B5: CHECK CIRCUIT 31S-LC17 (BK/YE) FOR OPEN
1
Disconnect Rear Interior Lamp C891.
2
Make sure that a door is open.

3
Measure the resistance between the rear interior lamp C891 pin 1, circuit 31S-LC17 (BK/YE), harness side and ground.

Is the resistance less than 5 ohms?
Yes
INSTALL a new rear interior lamp. TEST the system for normal operation.
No
REPAIR circuit 31S-LC17 (BK/YE). TEST the system for normal operation.

PINPOINT TEST C : THE LUGGAGE COMPARTMENT LAMP IS INOPERATIVE

TEST CONDITIONS DETAILS/RESULTS/ACTIONS
C1: CHECK VOLTAGE TO THE LUGGAGE COMPARTMENT LAMP CIRCUIT 29-LB25 (OG/BU) OR 29-LB6 (OG/YE)
1
Ignition switch in position 0.
2
Disconnect Luggage Compartment Lamp C820 (except wagon) or C887 (wagon).

3
Measure the voltage between the luggage compartment lamp C820 pin 2, circuit 29-LB25 (OG/BU) (except wagon), or C887 pin 1, circuit 29-LB6 (OG/YE) (wagon only), harness side and ground.

Is the voltage greater than 10 volts?
Yes
For wagon only, GO to C2. For 3-door, 4-door and 5-door, GO to C3.
No
REPAIR circuit 29-LB25 (OG/BU) (except wagon), or circuit 29-LB6 (OG/YE) (wagon only). TEST the system for normal operation.
C2: CHECK GROUND TO LUGGAGE COMPARTMENT LAMP (WAGON ONLY)
NOTE:
NOTE:The liftgate/luggage compartment lid must be open
1
Disconnect Luggage Compartment Lamp C888.

2
Measure the resistance between the luggage compartment lamp C888 pin 2, circuit 31-LB6 (BK) harness side and ground

Is the resistance less than 5 ohms?
Yes
No
REPAIR circuits 31S-LB6 (BK) TEST the system for normal operation.
C3: CHECK THE LUGGAGE COMPARTMENT LAMP CIRCUITS FOR OPEN
1
Disconnect Luggage Compartment Lamp Switch C798 (wagon only).
2
Disconnect Luggage Compartment Lamp Switch C800 (except wagon).

3
Measure the resistance between the luggage compartment lamp C888 (wagon only) pin 1, circuit 31S-LB6 (BK/YE) or C820 (except wagon) pin 1, circuit 31S-LB25 (BK/BU), harness side and the luggage compartment lamp switch C798 (wagon only) pin 4, or C800 (except wagon) pin 4, circuit 31S-LB1 (BK/BU) harness side.

Is the resistance less than 5 ohms?
Yes
No
REPAIR circuit 31S-LB6 (BK/YE), circuit 31S-LB25 (BK/BU) or circuit 31S-LB1 (BK/BU). TEST the system for normal operation.
C4: CHECK GROUND TO THE LUGGAGE COMPARTMENT LAMP SWITCH

1
Measure the resistance between the luggage compartment switch C798 (wagon only) pin 3, or C800 (except wagon) pin 3, circuit 31-GL20 (BK) harness side and ground.

Is the resistance less than 5 ohms?
Yes
No
REPAIR circuit 31-GL20 (BK). TEST the system for normal operation.
C5: CHECK THE OPERATION OF THE LUGGAGE COMPARTMENT SWITCH
1
Connect Luggage Compartment Lamp Switch C798 (wagon only).
2
Connect Luggage Compartment Lamp Switch C800 (except wagon).

3
Measure the resistance between the luggage compartment lamp C888 (wagon only) pin 1, circuit 31S-LB6 (BK/YE) or C820 (except wagon) pin 1, circuit 31S-LB25 (BK/BU), harness side and ground. Note the reading with the luggage compartment lamp switch pressed (door open) as well as released (door closed).

Is the resistance less than 5 ohms (door open) and greater than 10,000 ohms (door closed)?
Yes
INSTALL a new luggage compartment lamp. TEST the system for normal operation.
No
INSTALL a new luggage compartment switch. TEST the system for normal operation.

PINPOINT TEST D : THE MAP READING LAMP IS INOPERATIVE

TEST CONDITIONS DETAILS/RESULTS/ACTIONS
D1: CHECK POWER TO THE FRONT INTERIOR LAMP
1
Position the front interior lamp switch in the ON position.

Does the front interior lamp operate?
Yes
No
GO to Pinpoint Test A.
D2: CHECK THE GROUND TO THE FRONT INTERIOR LAMP
1
Disconnect Front Interior Lamp C890.

2
Measure the resistance between the front interior lamp C890 pin 2, circuit 31-LC7 (BK), harness side and ground.

Is the resistance less than 5 ohms?
Yes
INSTALL a new front interior lamp. TEST the system for normal operation.
No
REPAIR circuit 31-LC7 (BK). TEST the system for normal operation.

PINPOINT TEST E : THE VANITY MIRROR ILLUMINATION IS INOPERATIVE

TEST CONDITIONS DETAILS/RESULTS/ACTIONS
E1: CHECK THE OPERATION OF THE INTERIOR LAMP
1
CHECK the interior lamp operates correctly in the ON position.

Does the interior lamp operate correctly?
Yes
No
GO to Pinpoint Test A.
E2: CHECK THE VANITY MIRROR LAMP FOR VOLTAGE
1
Disconnect Vanity Mirror Lamp C844 (Left-Hand) or C845 (Right-Hand).

2
Measure the voltage between the vanity mirror lamp C844 pin 3, circuit 29-LB16 (OG/GN) (left-hand side), or C845 pin 3, circuit 29-LB23 (OG/WH) (right-hand side), harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
REPAIR circuit 29-LB16 (OG/GN) (left-hand side), or C845 pin 3, circuit 29-LB23 (OG/WH) (right-hand side). TEST the system for normal operation.
E3: CHECK THE VANITY MIRROR LAMP FOR GROUND

1
Measure the resistance between the vanity mirror lamp C844 pin 1, circuit 31-LB16 (BK) (left-hand side), or C845 pin 1, circuit 31-LB23 (BK) (right-hand side), harness side and ground.

Is the resistance less than 5 ohms?
Yes
INSTALL a new vanity mirror lamp.
No
REPAIR circuit 31-LB16 (BK) or 31-LB23 (BK). TEST the system for normal operation.

PINPOINT TEST F : THE GLOVE COMPARTMENT ILLUMINATION IS INOPERATIVE

TEST CONDITIONS DETAILS/RESULTS/ACTIONS
F1: CHECK THE GLOVE COMPARTMENT LAMP FOR VOLTAGE
1
Disconnect Glove Compartment Lamp C846.

2
Measure the voltage between the glove compartment lamp C846 pin 1 circuit 29-LB8 (OG) harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
REPAIR circuit 29-LB8 (OG). TEST the system for normal operation.
F2: CHECK THE GLOVE COMPARTMENT LAMP FOR GROUND

1
Measure the resistance between the glove box lamp switch C646 pin 2, circuit 31-LB8 (BK) harness side and ground.

Is the resistance less than 5 ohms?
Yes
INSTALL a new glove compartment lamp
No
REPAIR circuit 31-LB8 (BK). TEST the system for normal operation.

PINPOINT TEST G : THE FOOTWELL LAMP IS INOPERATIVE

TEST CONDITIONS DETAILS/RESULTS/ACTIONS
G1: CHECK THE OPERATION OF THE INTERIOR LAMP
1
CHECK the interior lamp operates correctly in the ON position with any door open.

Does the interior lamp operate correctly?
Yes
No
GO to Pinpoint Test A.
G2: CHECK THE FOOTWELL LAMP FOR VOLTAGE
1
Disconnect Footwell Lamp C842 (left front) or C843 (right front).

2
Measure the voltage between the footwell lamp C842 (left front) pin 1, circuit 29-LC11 (OG/WH) or C843 (right front) pin 1, circuit 29-LC23 (OG/WH) harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
REPAIR circuit 29-LC11 (OG/WH) (left front) or circuit 29-LC23 (OG/WH) (right front). TEST the system for normal operation.
G3: CHECK THE FOOTWELL LAMP FOR GROUND

1
Measure the resistance between the footwell lamp C842 (left front) pin 2, circuit 31S-LC11 (BK/WH) or C843 (right front) pin 2, circuit 31S-LC23 (BK/WH) harness side and ground.

Is the resistance less than 5 ohms?
Yes
INSTALL a new footwell lamp.
No
REPAIR circuit 31S-LC11 (BK/WH) (left front) or circuit 31S-LC23 (BK/WH) (right front). TEST the system for normal operation.

Component Test

  1. Remove the relay.
  1. Using a jumper wire, connect one end to Terminal 85 of the relay. Connect the other end to ground.
  1. Using a second jumper wire, connect one end to Terminal 86 of the relay.
  1. Connect one lead of an ohmmeter to Terminal 30 of the relay. Connect the second lead to Terminal 87 of the relay. Note the resistance.
  1. Momentarily tap the unconnected end of the Terminal 86 jumper wire to the positive battery power. An audible click should be heard and the resistance on the ohmmeter should drop to zero.
  1. If routed here from a Pinpoint Test, return to that Pinpoint Test.

417-04 Daytime Running Lamps (DRL) > < Interior Lighting - Vehicles Built Up To: 08-2001