Interior Lighting System: Diagnosis Ford Focus I рестайлинг

Inspection And Verification

1. Verify the customer concern.
2. Visually inspect for obvious signs of mechanical or electrical damage. VISUAL INSPECTION CHART Mechanical Electrical Door ajar switch(es) Central junction box (CJB) fuse(s): 35 (7.5A) 36 (7.5A) 63 (20A) Interior map lamps Circuitry Generic electronic module (GEM)
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 cause is not visually evident, connect the diagnostic tool to the data link connector and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle: check that the program card is correctly installed. check the connections to the vehicle. check the ignition switch position.
5. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
6. Carry out the data link diagnostics test. If the diagnostic tool responds with: SCP, CAN or UBP circuit fault; all electronic control units no response/not equipped, refer to «MODULE COMMUNICATIONS NETWORK»(ref-207799) . No response/not equipped for generic electronic module (GEM), REFER to «MULTIFUNCTION ELECTRONIC MODULE»(ref-207803) . System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out self-test diagnostics for the GEM module.
7. If the DTCs retrieved are related to the concern, go to the «GENERIC ELECTRONIC MODULE (GEM) DIAGNOSTIC TROUBLE CODE (DTC) INDEX»(ref-207797-S13288167212005120100000) to continue diagnostics.
8. If no DTCs related to the concern are retrieved, GO to «SYMPTOM CHART»(ref-207797-S22457912922005120100000) .
9. If the DTCs are retrieved that are not found in the following GEM Diagnostic Trouble Code (DTC) Index, refer to the master Diagnostic Trouble Code (DTC) Index in «MULTIFUNCTION ELECTRONIC MODULE»(ref-207803) .

Generic Electronic Module (GEM) Diagnostic Trouble Code (DTC) Index

GENERIC ELECTRONIC MODULE (GEM) DIAGNOSTIC TROUBLE CODE (DTC) INDEX

Symptom Chart

SYMPTOM CHART

PINPOINT TEST A: THE FRONT INTERIOR LAMP IS INOPERATIVE

A1 VERIFY THE CONCERN

1. Check for operation of the interior lamp in both the ON and 12 SEC positions.
2. Is the interior lamp inoperative in both positions?

Yes

GO to A16

No

If inoperative in the 12 SEC position, GO to A2.

If inoperative in the ON position, GO to A11.

A2 CHECK INPUT FROM THE INTERIOR LAMP SWITCHES

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.
2. 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

GO to A11.

A3 CHECK THE DRIVER DOOR INTERIOR LAMP SWITCH SIGNAL TO MODULE

Scheme 1

1. Disconnect: GEM C201d.
2. Measure the resistance between the GEM C201d pin 21, (LHD) or pin 22, (RHD) component side and ground. Note the reading with the door interior lamp switch pressed (door closed) as well as released (door open).
3. 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

GO to A4.

A4 CHECK THE DRIVER DOOR PIN CIRCUIT FOR OPEN

Scheme 2

1. Disconnect: Driver Interior Lamp Switch C526 (LHD), C602 (RHD).
2. Measure the resistance between interior lamp switch C526 pin 1, (LHD) or C602 pin 1, (RHD), harness side and GEM C201d pin 21, (LHD) or pin 22, (RHD) harness side.
3. Is the resistance less than 5 ohms?

Yes

GO to A5.

No

REPAIR circuit 31S-GL16 (BK/BU) for LHD or circuit 31S-GL9 (BK/YE) for RHD. TEST the system for normal operation.

A5 CHECK GROUND CIRCUIT TO DRIVER DOOR INTERIOR LAMP SWITCH FOR OPEN

Scheme 3

1. Measure the resistance between interior lamp switch C526 pin 2, circuit 31-GL9 (BK) (LHD) or C602 pin 2, circuit 31-GL16 (BK) (RHD) harness side and ground.
2. 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) LHD or circuit 31-GL16 (BK) RHD. TEST the system for normal operation.

A6 CHECK THE DOOR INTERIOR LAMP SWITCH SIGNAL TO MODULE

Scheme 4

1. Disconnect: GEM C201 a.
2. Disconnect: GEM C201b.
3. Measure the resistance between GEM C201 a pin 18, circuit 31S-GL19 (BK/GN) harness side and ground, GEM C201 b pin 15, circuit 31S-GL12 (BK/OG) harness side and ground, GEM C201d pin 21, circuit 31S-GL16 (BK/BU) harness side and ground, and GEM C201d pin 22, circuit 31S-GL9 (BK/YE) harness side and ground. Note the reading with the door interior lamp switch pressed (door closed) as well as released (door open).
4. Is the resistance greater than 10,000 ohms with the switch pressed and less than 5 ohms with the switch at released?

Yes

INSTALL a new GEM. TEST the system for normal operation.

No

GO to A7.

A7 CHECK THE DOOR INTERIOR LAMP CIRCUITS FOR OPEN

Scheme 5

1. Disconnect: Interior Lamp Switches C720, C815, C602 and C526.
2. Disconnect: GEM C201 a.
3. Measure the resistance between GEM C201 a pin 18, circuit 31S-GL19 (BK/GN) harness side and interior lamp switch C815 pin 1, circuit 31S-GL19 (BK/GN) harness side, GEM C201 b pin 15, circuit 31S-GL12 (BK/OG) harness side and interior lamp switch C720 pin 1, circuit 31S-GL12 (BK/OG) harness side, GEM C201d pin 21, circuit 31S-GL16 (BK/BU) harness side and interior lamp switch C526 pin 1, circuit 31S-GL16 (BK/BU) harness side, and GEM C201 d pin 22, circuit 31S-GL9 (BK/YE) harness side and interior lamp switch C602 pin 1, circuit 31S-GL9 (BK/YE) harness side.
4. Is the resistance less than 5 ohms?

Yes

GO to A8.

No

REPAIR circuit 31S-GL16 (BK/BU) for passenger LHD or circuit 31S-GL9 (BK/YE) for passenger RHD. For rear doors repair circuit 31S-GL19 (BK/GN) (rear right), or circuit 31S-GL12 (BK/OG) (left rear). TEST the system for normal operation.

A8 CHECK GROUND CIRCUIT TO DOOR INTERIOR LAMP SWITCH FOR OPEN

Scheme 6

1. Measure the resistance between interior lamp switch C602 pin 1, (passenger LHD) or C526 pin1 (passenger RHD), or C720 pin 1 (right rear), or C815 pin 1 (left rear) harness side and ground.
2. Is the resistance less than 5 ohms?

Yes

GO to A9.

No

REPAIR circuit 31-GL9 (BK) RHD or circuit 31-GL16 (BK) LHD. For rear doors REPAIR circuit 31-GL19 (BK) (right rear) or circuit 31-GL12 (BK) (left rear). TEST the system for normal operation.

A9 CHECK FRONT INTERIOR LAMP FOR OPEN

Scheme 7

1. Disconnect: Front Interior Lamp C918a.
2. Disconnect: Front Interior Lamp C918b.
3. Position the front interior lamp switch in the 12 SEC position.
4. Measure the resistance between the front interior lamp C918a pin 1 and front interior lamp C918b pin 1 (component side).
5. Is the resistance less than 5 ohms?

Yes

GO to A10.

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

Scheme 8

1. Measure the resistance between the front interior lamp C918b pin 2, circuit 31-LC7 (BK), harness side and ground.
2. Is the resistance less than 5 ohms?

Yes

INSTALL a new door interior lamp switch. TEST the system for normal operation.

No

REPAIR circuit 31-LC7 (BK). TEST the system for normal operation.

A11 CHECK CIRCUIT 29-LC7 (OG/BU) FOR VOLTAGE

Scheme 9

1. Disconnect: Front interior lamp C918a.
2. Measure the voltage between the front interior lamp C918a pin 1, circuit 29-LC7 (OG/BU), harness side and ground.
3. Is the voltage greater than 10 volts?

Yes

GO to A15.

No

GO to A12.

A12 CHECK CIRCUIT 29-LC7 (OG/BU) FOR OPEN

Scheme 10

1. Disconnect: Battery Saver Relay.
2. Measure the resistance between the battery saver relay pin 5, and C918a pin1, circuit 29-LC7 (OG/BU), harness side.
3. Is the resistance less than 5 ohms?

Yes

GO to A13.

No

REPAIR circuit 29-LC7 (OG/BU). TEST the system for normal operation.

A13 CHECK POWER SUPPLY TO THE BATTERY SAVER RELAY

Scheme 11

1. Measure the voltage between the battery saver relay pin 3, circuit 30-DA1 (RD), harness side and ground.
2. Is the voltage greater than 10 volts?

Yes

GO to A14

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.

A14 CHECK CONDITION OF BATTERY SAVER RELAY

1. Carry out a component test on the battery saver relay. For additional information, refer to «COMPONENT TEST»(ref-207797-S00571890342005120100000) .
2. 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.

A15 CHECK GROUND CIRCUIT TO FRONT INTERIOR LAMP

Scheme 12

1. Disconnect: Front Interior Lamp C918b.
2. Measure the resistance between the front interior lamp C918b pin 2, circuit 31-LC7 (BK), harness side and ground.
3. 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.

A16 CHECK CONDITION OF FRONT INTERIOR LAMP BULB

1. Remove and inspect the front interior lamp bulb.
2. Is the front interior lamp bulb OK?

Yes

GO to A17.

No

INSTALL a new front interior lamp bulb. TEST the system for normal operation.

A17 CHECK CIRCUIT 29-LC7 (OG/BU) FOR VOLTAGE

Scheme 13

1. Disconnect: Front Interior Lamp C918a.
2. Measure the voltage between the front interior lamp C899 pin 1, circuit 29-LC7 (OG/BU), harness side and ground.
3. Is the voltage greater than 10 volts?

Yes

INSTALL a new front interior lamp. TEST the system for normal operation.

No

GO to A18.

A18 CHECK CIRCUIT 29-LC7 (OG/BU) FOR OPEN

Scheme 14

1. Disconnect: Battery Saver Relay.
2. Measure the resistance between the battery saver relay pin 5 and the front interior lamp C918a pin1, circuit 29-LC7 (OG/BU), harness side
3. Is the resistance less than 5 ohms?

Yes

GO to A19.

No

REPAIR circuit 29-LC7 (OG/BU). TEST the system for normal operation.

A19 CHECK POWER SUPPLY TO THE BATTERY SAVER RELAY

Scheme 15

1. Measure the voltage between the battery saver relay pin 3, circuit 30-DA1 (RD), harness side and ground.
2. Is the voltage greater than 10 volts?

Yes

GO to A20.

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. For additional information, refer to «COMPONENT TEST»(ref-207797-S00571890342005120100000) .
2. 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: LUGGAGE COMPARTMENT LAMP IS INOPERATIVE

B1 CHECK VOLTAGE TO THE LUGGAGE COMPARTMENT LAMP CIRCUIT 29-LB25 (OG/BU) OR 29-LB6 (OG/YE)

Scheme 16

1. Key in OFF position.
2. Disconnect: Luggage Compartment Lamp C428 or C849a (wagon).
3. Measure the voltage between the luggage compartment lamp C428 pin 2, circuit 29-LB25 (OG/BU) (except wagon), or C849a pin 1 circuit 29-LB6 (OG/YE) (wagon only), harness side and ground.
4. Is the voltage greater than 10 volts?

Yes

GO to B2.

No

REPAIR circuit 29-LB25 (OG/BU) (except wagon), or circuit 29-LB6 (OG/YE) (wagon only). TEST the system for normal operation.

B2 CHECK GROUND TO LUGGAGE COMPARTMENT LAMP

Note. The liftgate/luggage compartment lid must be open.

Scheme 17

1. Disconnect: Luggage Compartment Lamp C849b (wagon only).
2. Disconnect: Liftgate/Luggage Comp. Switch C4223.
3. Measure the resistance between the luggage compartment lamp C428 pin 1, circuit 31S-LB25A (BK/OG), harness side (except wagon), or cargo lamp C849b pin 1, circuit 31S-LB6 (BK/YE), harness side (wagon only) and ground.
4. Is the resistance less than 5 ohms?

Yes

INSTALL a new luggage compartment lamp (except wagon) or cargo lamp (wagon only). CLEAR the DTCs. REPEAT the self-test.

No

GO to B3.

B3 CHECK CIRCUIT 31-GL20 (BK) OR CIRCUIT 31-AA27 (BK) FOR OPEN

Scheme 18

1. Measure the resistance between the luggage compartment lid release relay C4086 pin 5, circuit 31-AA27 (BK), harness side and ground (late build sedan); or between the liftgate/decklid latch assembly C4223 pin 3, circuit 31-GL20 (BK), harness side and ground (all others).
2. Is the resistance less than 5 ohms?

Yes

INSTALL a new luggage compartment lid release relay (late build sedan) or INSTALL a new liftgate/decklid latch assembly. CLEAR the DTCs. REPEAT the self-test.

No

REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST C: A MAP READING LAMP IS INOPERATIVE

C1 CHECK POWER TO THE FRONT INTERIOR LAMP

1. Position the front interior lamp switch in the ON position.
2. Does the front interior lamp operate?

Yes

CHECK the condition of the bulb. If the bulb is blown INSTALL a new bulb. If the bulb is OK INSTALL a new front interior lamp. TEST the system for normal operation.

No

GO to C2.

C2 CHECK THE GROUND TO THE FRONT INTERIOR LAMP

Scheme 19

1. Disconnect: Front Interior Lamp C918b (except wagon) or C489b (wagon only).
2. Measure the resistance between the front interior lamp C918b pin 2, circuit 31-LC7 (BK), or C489b pin 2, circuit 31 -LB6 (BK), harness side and ground.
3. 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) or 31-LB6 (BK). TEST the system for normal operation.

Component Test

1. Remove the relay.
2. Using a jumper wire, connect one end to Terminal 85 of the relay. Connect the other end to ground.
3. Using a second jumper wire, connect one end to Terminal 86 of the relay.
4. 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.
5. 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.
6. If routed here from a Pinpoint Test, return to that Pinpoint Test.