Interior Lighting: Diagnosis Ford Fusion 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 Courtesy lamps Map lamps Luggage compartment lamp Vanity lamps Glove compartment lamp Ambient lighting switch (if equipped) Smart junction box (SJB) fuse 3 (15A) Wiring, terminals or connectors SJB
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 scan tool to the data link connector (DLC).
5. If the scan tool does not communicate with the VCM: Check the VCM connection to the vehicle. Check the scan tool connection to the VCM. Refer to «MODULE COMMUNICATIONS NETWORK»(ref-291879) article, No Power To The Scan Tool, to diagnose no communication with the scan tool.
6. If the scan tool does not communicate with the vehicle: Verify the ignition key is in the ON position. Verify the scan tool operation with a known good vehicle. Refer to «MODULE COMMUNICATIONS NETWORK»(ref-291879) article to diagnose no response from the PCM.
7. Carry out the network test. If the scan tool responds with no communication with the SJB, refer to «MODULE COMMUNICATIONS NETWORK»(ref-291879) article. If the network test passes, retrieve and record the continuous memory DTCs.
8. Clear the continuous DTCs and carry out the self-test diagnostics for the SJB.
9. If the DTCs retrieved are related to the concern, go to DTC Charts. For all other DTCs, refer to «MULTIFUNCTION ELECTRONIC MODULES»(ref-291878) article.
10. If no DTCs related to the concern are retrieved, go to «Symptom Chart»(ref-291888-S13352117292008073000000) .

DTC Charts

SMART JUNCTION BOX (SJB) DTC CHART

Symptom Chart

Symptom Chart

Pinpoint Test A: The Courtesy Lamps Are Inoperative

Refer to SYSTEM WIRING DIAGRAMS article for Fusion, SYSTEM WIRING DIAGRAMS article for Milan or SYSTEM WIRING DIAGRAMS article for MKZ, Interior Lamps for schematic and connector information.

Scheme 3

Scheme 4

Scheme 5

1. A1 CHECK CIRCUIT CLN26 (BU) FOR AN OPEN Key in OFF position. Disconnect: SJB C2280e NOTE: If the fuse fails, repair circuit CLN26 (BU) for a short to ground. For MKZ, clear the DTCs and repeat the self-test after the repair. Connect a fused jumper wire between the SJB C2280e-16, circuit CLN26 (BU), harness side and battery positive. Do the courtesy lamps illuminate? YES : REMOVE the jumper wire. VERIFY the SJB fuse 3 (15A) is OK. If OK, go to A3 . If not OK, REFER to the Wiring Diagrams article to identify the possible causes of the circuit short. NO : REMOVE the jumper wire. Go to A2 .
2. A2 CHECK CIRCUIT CLN09 (YE/GN) FOR A SHORT TO GROUND NOTE: If the fuse fails, repair circuit CLN09 (YE/GN) for a short to ground. Connect a fused jumper wire between the SJB C2280e-2, circuit CLN09 (YE/GN), harness side and battery positive. Operate the demand lighting on one of the interior lamps. Does the demand lighting operate correctly? YES : REMOVE the jumper wire. VERIFY the SJB fuse 3 (15A) is OK. If OK, go to A3 . If not OK, REFER to the Wiring Diagrams article to identify the possible causes of the circuit short. NO : REMOVE the jumper wire. Go to A4 .
3. A3 CHECK CIRCUIT GD139 (BK/YE) FOR AN OPEN Key in OFF position. Disconnect: Front Interior Lamp C930 Measure the resistance between the front interior lamp C930-1, circuit GD139 (BK/YE), harness side and ground. Is the resistance less than 5 ohms? YES : REPAIR circuit CLN26 (BU) for an open. TEST the system for normal operation. NO : REPAIR the circuit. TEST the system for normal operation.
4. A4 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion damaged pins pushed-out pins Connect all the SJB connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new SJB. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-291878) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test B: An Individual Courtesy Lamp Is Inoperative

Refer to SYSTEM WIRING DIAGRAMS article for Fusion, SYSTEM WIRING DIAGRAMS article for Milan or SYSTEM WIRING DIAGRAMS article for MKZ, Interior Lamps for schematic and connector information.

Refer to SYSTEM WIRING DIAGRAMS article for Fusion, SYSTEM WIRING DIAGRAMS article for Milan or SYSTEM WIRING DIAGRAMS article for MKZ, Luggage Compartment Lid Release for schematic and connector information.

1. B1 CHECK THE COURTESY LAMP Key in OFF position. Disconnect: Suspect Interior Lamp Operate the courtesy lamps by opening the LF door. Measure the voltage between the suspect courtesy lamp, harness side as follows: Location Connector-Pin/ Circuit Connector-Pin/ Circuit Front interior lamp C930-3 CLN26 (BU) C930-1 GD139 (BK/YE) Rear interior lamp C901-1 CLN26 (BU) C901-2 GD139 (BK/YE) Luggage compartment lamp C4198-1 CLN26 (BU) C4198-2 GD139 (BK/YE) Is the voltage greater than 10 volts? YES : INSTALL a new interior lamp for the suspect lamp. REFER to «Interior Lamp - Front»(ref-291888-S20403260882008073000000) or «Interior Lamp - Rear»(ref-291888-S17812235662008073000000) . TEST the system for normal operation. NO : Go to B2 .
2. B2 CHECK CIRCUIT CLN26 (BU) FOR VOLTAGE Measure the voltage between the suspect courtesy lamp, harness side and ground as follows: Location Connector-Pin Circuit Front interior lamp C930-3 CLN26 (BU) Rear interior lamp C901-1 CLN26 (BU) Luggage compartment lamp C4198-1 CLN26 (BU) Is the voltage greater than 10 volts? YES : REPAIR circuit GD139 (BK/YE) for the lamp in question. TEST the system for normal operation. NO : REPAIR circuit CLN26 (BU) for the lamp in question. TEST the system for normal operation.

Pinpoint Test C: The Courtesy Lamps Stay On Continuously

Refer to SYSTEM WIRING DIAGRAMS article for Fusion, SYSTEM WIRING DIAGRAMS article for Milan or SYSTEM WIRING DIAGRAMS article for MKZ, Interior Lamps for schematic and connector information.

Refer to SYSTEM WIRING DIAGRAMS article for Fusion, SYSTEM WIRING DIAGRAMS article for Milan or SYSTEM WIRING DIAGRAMS article for MKZ, Power Door Locks for schematic and connector information.

Refer to SYSTEM WIRING DIAGRAMS article for Fusion, SYSTEM WIRING DIAGRAMS article for Milan or SYSTEM WIRING DIAGRAMS article for MKZ, Luggage Compartment Lid Release for schematic and connector information.

1. C1 CHECK THE SJB DTCs NOTE: Make sure all doors (including the luggage compartment lid) are closed and that the instrument panel dimmer switch is not in the DOME LAMPS position before running the SJB on-demand self-test, or the results may not be accurate. Carry out the SJB on-demand self-test. Are any DTCs recorded? YES : For DTC B1320, B1328, B1331, B1336 or B1572, go to C2 . For DTC B1688, go to C6 . For all other DTCs, REFER to «DTC Charts»(ref-291888-S33104114572008073000000) . NO : Go to C8 .
2. C2 CHECK THE AJAR SWITCH GROUND CIRCUIT FOR AN OPEN Key in OFF position. Disconnect: Suspect Ajar Switch Measure the resistance between the suspect ajar switch, harness side and ground as follows: Location Connector-Pin Circuit LH front C525-6 GD126 (BK/WH) RH front C603-6 GD139 (BK/YE) LH rear C704-6 GD126 (BK/WH) RH rear C804-6 GD139 (BK/YE) Luggage compartment C429-1 GD171 (BK/GY) Is the resistance less than 5 ohms? YES : Go to C3 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
3. C3 CHECK THE AJAR SWITCH FOR VOLTAGE Measure the voltage between the suspect ajar switch, harness side and ground as follows: Location Suspect Ajar Switch Connector- Pin Circuit LH front C525-8 CPL26 (GN/VT) RH front C603-8 CPL31 (WH) LH rear C704-8 CPL36 (GN) RH rear C804-8 CPL39 (YE) Luggage compartment C429-1 CPL44 (YE/OG) Is the voltage greater than 10 volts? YES : INSTALL a new latch for the ajar switch in question. REFER to «HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS»(ref-291867) article. CLEAR the DTCs. REPEAT the self-test. NO : Go to C4 .
4. C4 CHECK THE AJAR SWITCH CIRCUIT FOR AN OPEN Disconnect: SJB C2280c Measure the resistance between the suspect ajar switch, harness side and the SJB, harness side as follows: Location SJB Connector- Pin Suspect Ajar Switch Connector- Pin Circuit LH front C2280c-11 C525-8 CPL26 (GN/VT) RH front C2280c-12 C603-8 CPL31 (WH) LH rear C2280c-8 C704-8 CPL36 (GN) RH rear C2280c-7 C804-8 CPL39 (YE) Luggage compartment C2280c-6 C429-1 CPL44 (YE/OG) Is the resistance less than 5 ohms? YES : Go to C5 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
5. C5 CHECK THE AJAR SWITCH OPERATION Connect: Suspect Ajar Switch Measure the resistance between the SJB, harness side and ground, while opening and closing the suspect door (or the luggage compartment) as follows: Location SJB Connector- Pin Circuit LH front C2280c-11 CPL26 (GN/VT) RH front C2280c-12 CPL31 (WH) LH rear C2280c-8 CPL36 (GN) RH rear C2280c-7 CPL39 (YE) Luggage compartment C2280c-6 CPL44 (YE/OG) Is the resistance less than 5 ohms when the suspect door (or the luggage compartment) is closed, and greater than 10,000 ohms when the suspect door (or the luggage compartment) is open? YES : Go to C9 . NO : INSTALL a new latch for the switch in question. REFER to «HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS»(ref-291867) article. CLEAR the DTCs. REPEAT the self-test.
6. C6 CHECK THE INSTRUMENT PANEL DIMMER SWITCH Key in OFF position. Disconnect: Instrument Panel Dimmer Switch C2065 Observe the courtesy lamps. Are the courtesy lamps still illuminated? YES : Go to C7 . NO : INSTALL a new instrument panel dimmer switch. REFER to «INSTRUMENT CLUSTER AND PANEL ILLUMINATION»(ref-291943) article. CLEAR the DTCs. REPEAT the self-test.
7. C7 CHECK CIRCUIT CLN28 (GN/BU) FOR A SHORT TO GROUND Disconnect: SJB C2280d Observe the courtesy lamps. Are the courtesy lamps still illuminated? YES : Go to C9 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
8. C8 CHECK CIRCUIT CLN26 (BU) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: SJB C2280e Observe the courtesy lamps. Are the courtesy lamps still illuminated? YES : REPAIR the circuit. TEST the system for normal operation. NO : Go to C9 .
9. C9 CHECK FOR CORRECT SJB OPERATION Connect: Luggage Compartment Lid Ajar Switch C429 (if disconnected) Connect: Suspect Door Ajar Switch (if disconnected) Disconnect all the SJB connectors. Check for: corrosion damaged pins pushed-out pins Connect all the SJB connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new SJB. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-291878) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

Pinpoint Test D: The Courtesy Lamps Do Not Turn On With One Door Open

Refer to SYSTEM WIRING DIAGRAMS article for Fusion, SYSTEM WIRING DIAGRAMS article for Milan or SYSTEM WIRING DIAGRAMS article for MKZ, Power Door Locks for schematic and connector information.

Refer to SYSTEM WIRING DIAGRAMS article for Fusion, SYSTEM WIRING DIAGRAMS article for Milan or SYSTEM WIRING DIAGRAMS article for MKZ, Luggage Compartment Lid Release for schematic and connector information.

1. D1 CHECK THE AJAR SWITCH PIDs Key in ON position. Enter the following diagnostic mode on the diagnostic tool: SJB DataLogger Monitor the SJB ajar switch PIDs while opening and closing the suspect door or the luggage compartment lid as follows: Suspect Ajar Switch PID LF door D_DR_SW RF door P_DR_SW LR door LRDR_SW RR door RRDR_SW Luggage compartment lid DECKLID Does the PID value agree with the ajar switch position? YES : Go to D4 . NO : Go to D2 .
2. D2 CHECK THE DOOR AJAR SWITCH OPERATION Key in OFF position. Disconnect: Suspect Ajar Switch Observe the interior lamps. Do the interior lamps illuminate with the suspect ajar switch disconnected? YES : INSTALL a new door latch or luggage compartment lid latch for the suspect ajar switch. REFER to «HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS»(ref-291867) article. TEST the system for normal operation. NO : Go to D3 .
3. D3 CHECK THE AJAR SWITCH CIRCUIT FOR A SHORT TO GROUND Disconnect: SJB C2280c Measure the resistance between the suspect ajar switch, harness side and ground as follows: Location Connector-Pin Circuit LF door C525-8 CPL26 (GN/VT) RF door C603-8 CPL31 (WH) LR door C704-8 CPL36 (GN) RR door C804-8 CPL39 (YE) Luggage compartment lid C429-1 CPL44 (YE/OG) Is the resistance greater than 10,000 ohms? YES : Go to D4 . NO : REPAIR the circuit. TEST the system for normal operation.
4. D4 CHECK FOR CORRECT SJB OPERATION Connect: Suspect Ajar Switch (If Disconnected) Disconnect all the SJB connectors. Check for: corrosion damaged pins pushed-out pins Connect all the SJB connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new SJB. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-291878) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test E: The Demand Lamps Are Inoperative

Refer to SYSTEM WIRING DIAGRAMS article for Fusion, SYSTEM WIRING DIAGRAMS article for Milan or SYSTEM WIRING DIAGRAMS article for MKZ, Interior Lamps for schematic and connector information.

1. E1 CHECK THE OPERATION OF THE COURTESY LAMPS Key in ON position. Operate the courtesy lamps by opening the LF door. Do the courtesy lamps illuminate? YES : Go to E2 . NO : Go to «Pinpoint Test A»(ref-291888-S22088116162008073000000) .
2. E2 CHECK CIRCUIT CLN09 (YE/GN) FOR AN OPEN Key in OFF position. Disconnect: SJB C2280e Connect a fused jumper wire between the SJB C2280e-2, circuit CLN09 (YE/GN), harness side and battery positive. Do the demand lamps illuminate? YES : REMOVE the jumper wire. Go to E3 . NO : REMOVE the jumper wire. REPAIR the circuit. TEST the system for normal operation.
3. E3 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion damaged pins pushed-out pins Connect all the SJB connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new SJB. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-291878) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test F: An Individual Demand Lamp Is Inoperative

Refer to SYSTEM WIRING DIAGRAMS article for Fusion, SYSTEM WIRING DIAGRAMS article for Milan or SYSTEM WIRING DIAGRAMS article for MKZ, Interior Lamps for schematic and connector information.

1. F1 CHECK CIRCUIT CLN09 (YE/GN) FOR VOLTAGE Key in OFF position. Disconnect: Suspect Demand Lamp Key in ON position. Measure the voltage between the suspect demand lamp, harness side and ground as follows: Location Connector-Pin Circuit RH vanity mirror lamp C906-1 CLN09 (YE/GN) LH vanity mirror lamp C907-1 CLN09 (YE/GN) Front interior lamp C930-2 CLN26 (BU) Rear interior lamp C901-3 CLN09 (YE/GN) Glove compartment lamp C254-1 CLN09 (YE/GN) Is the voltage greater than 10 volts? YES : Go to F2 . NO : REPAIR the circuit in question. TEST the system for normal operation.
2. F2 CHECK THE GROUND CIRCUIT FOR AN OPEN Measure the resistance between the suspect demand lamp connector, harness side and ground as follows: Location Connector-Pin Circuit RH vanity mirror lamp C906-2 GD139 (BK/YE) LH vanity mirror lamp C907-2 GD139 (BK/YE) Front interior lamp C930-1 GD139 (BK/YE) Rear interior lamp C901-2 GD139 (BK/YE) Glove compartment lamp Case ground - Is the resistance less than 5 ohms? YES : INSTALL a new demand lamp for the suspect lamp. TEST the system for normal operation. NO : REPAIR the circuit in question. TEST the system for normal operation.

PINPOINT TEST G: THE ILLUMINATED ENTRY IS INOPERATIVE WHEN USING THE REMOTE KEYLESS ENTRY (RKE) TRANSMITTER

1. G1 CHECK FOR CORRECT RKE OPERATION Using the RKE transmitter, lock and unlock the doors. Do the doors lock and unlock? YES : Go to G2 . NO : REFER to «HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS»(ref-291867) article to continue diagnosis of the RKE system.
2. G2 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion damaged pins pushed-out pins Connect all the SJB connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new SJB. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-291878) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.

Pinpoint Test H: The Battery Saver Does Not Deactivate After Time-Out

Refer to SYSTEM WIRING DIAGRAMS article for Fusion, SYSTEM WIRING DIAGRAMS article for Milan or SYSTEM WIRING DIAGRAMS article for MKZ, Interior Lamps for schematic and connector information.

1. H1 CHECK CIRCUIT CLN09 (YE/GN) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: SJB C2280e Key in ON position. Operate the demand lamps. Do the demand lamps illuminate? YES : REPAIR the circuit. TEST the system for normal operation. NO : Go to H2 .
2. H2 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion damaged pins pushed-out pins Connect all the SJB connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new SJB. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-291878) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test I: The Puddle Lamps Are Inoperative

Refer to SYSTEM WIRING DIAGRAMS article for Fusion, SYSTEM WIRING DIAGRAMS article for Milan or SYSTEM WIRING DIAGRAMS article for MKZ, Interior Lamps for schematic and connector information.

1. I1 CHECK THE COURTESY LAMP OPERATION Operate the courtesy lamps by opening the LF door. Do the courtesy lamps illuminate? YES : Go to I2 . NO : Go to «Pinpoint Test A»(ref-291888-S22088116162008073000000) .
2. I2 CHECK CIRCUIT CLN26 (BU) FOR VOLTAGE Key in OFF position. Disconnect: Suspect Exterior Mirror Operate the courtesy lamps by opening the LF door. Measure the voltage between the suspect exterior mirror, harness side and ground as follows: Location Connector-Pin Circuit RH exterior mirror (without memory) C625-4 CLN26 (BU) RH exterior mirror (with memory) C626-5 CLN26 (BU) LH exterior mirror (without memory) C517-4 CLN26 (BU) LH exterior mirror (with memory) C522-5 CLN26 (BU) Is the voltage greater than 10 volts? YES : Go to I3 . NO : REPAIR the circuit in question. TEST the system for normal operation.
3. I3 CHECK THE GROUND CIRCUIT FOR AN OPEN Measure the resistance between the suspect exterior mirror, harness side and ground as follows: Location Connector-Pin Circuit RH exterior mirror (without memory) C625-6 GD139 (BK/YE) RH exterior mirror (with memory) C626-7 GD139 (BK/YE) LH exterior mirror (without memory) C517-6 GD126 (BK/WH) LH exterior mirror (with memory) C522-7 GD126 (BK/WH) Is the resistance less than 5 ohms? YES : INSTALL a new exterior mirror for the suspect exterior mirror. REFER to «REAR VIEW MIRRORS»(ref-291868) article. TEST the system for normal operation. NO : REPAIR the circuit in question. TEST the system for normal operation.

Pinpoint Test J: The Courtesy Lamps Are Inoperative From The Instrument Panel Dimmer Switch

Refer to SYSTEM WIRING DIAGRAMS article for Fusion, SYSTEM WIRING DIAGRAMS article for Milan or SYSTEM WIRING DIAGRAMS article for MKZ, Interior Lamps for schematic and connector information.

Scheme 6

Scheme 7

1. J1 CHECK THE DIMMABLE BACK LIGHTING ILLUMINATION Key in ON position. Turn the headlamps switch to the PARKING LAMPS ON position. Rotate the instrument panel dimmer switch and observe the instrument cluster illumination. Does the instrument cluster illumination intensity agree with the instrument panel dimmer switch position? YES : Go to J2 . NO : REFER to «INSTRUMENT CLUSTER AND PANEL ILLUMINATION»(ref-291943) article to continue diagnosis of the dimmable back lighting illumination.
2. J2 CHECK THE DIMMER SWITCH Key in OFF position. Disconnect: Dimmer Switch C2065 Connect a fused jumper wire between the dimmer switch C2065-2, circuit CLN28 (BN/BU), harness side and the dimmer switch C2065-4, circuit CLN27 (WH/BN), harness side. Do the courtesy lamps illuminate? YES : INSTALL a new instrument panel dimmer switch. REFER to «INSTRUMENT CLUSTER AND PANEL ILLUMINATION»(ref-291943) article. TEST the system for normal operation. NO : REMOVE the jumper wire. Go to J3 .
3. J3 CHECK CIRCUIT CLN28 (GN/BU) FOR AN OPEN Key in OFF position. Disconnect: Instrument Panel Dimmer Switch C2065 Disconnect: SJB C2280d Measure the resistance between the SJB C2280d-26, circuit CLN28 (GN/BU), harness side and the instrument panel dimmer switch C2065-2, circuit CLN28 (GN/BU), harness side. Is the resistance less than 5 ohms? YES : Go to J4 . NO : REPAIR the circuit. TEST the system for normal operation.
4. J4 CHECK FOR CORRECT SJB OPERATION Connect: Instrument Panel Dimmer Switch C2065 (If Disconnected) Disconnect all the SJB connectors. Check for: corrosion damaged pins pushed-out pins Connect all the SJB connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new SJB. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-291878) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test K: The Ambient Lighting Is Inoperative

Refer to SYSTEM WIRING DIAGRAMS article for Fusion, SYSTEM WIRING DIAGRAMS article for Milan or SYSTEM WIRING DIAGRAMS article for MKZ, Interior Lamps for schematic and connector information.

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13

1. K1 CHECK CIRCUIT CBP08 (GY/YE)/CBX07 (GN/RD) FOR AN OPEN (TO AMBIENT LIGHTING MODULE) Key in OFF position. Disconnect: Ambient Lighting Module C3251 Key in ON position. Measure the voltage between the ambient lighting module C3251-1, circuit CBX07 (GN/RD), harness side and ground. Is the voltage greater than 10 volts? YES : Go to K2 . NO : REPAIR circuit CBX07 (GN/RD) or CBP08 (GY/YE). TEST the system for normal operation.
2. K2 CHECK THE INPUT FROM CIRCUIT CLN54 (BN/YE) While pressing and releasing the ambient lighting switch, measure the voltage between the ambient lighting module C3251-2, circuit CLN54 (BN/YE), harness side and ground. Is the voltage greater than 10 volts with the switch pressed, and 0 volts with the switch released? YES : Go to K3 . NO : If voltage is always present, go to K4 . If no voltage is present, go to K5 .
3. K3 CHECK CIRCUIT GD908 (BK)/GD116 (BK/VT) FOR AN OPEN Key in OFF position. Measure the resistance between the ambient lighting module C3251-8, circuit GD908 (BK), harness side and ground. Is the resistance less than 5 ohms? YES : Go to K7 . NO : REPAIR circuit GD908 (BK) or GD116 (BK/VT). TEST the system for normal operation.
4. K4 CHECK CIRCUIT CLN54 (BN/YE) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: Ambient Lighting Switch C3250 Key in ON position. Measure the voltage between the ambient lighting module C3251-2, circuit CLN54 (BN/YE), harness side and ground. Is any voltage present? YES : REPAIR the circuit. TEST the system for normal operation. NO : INSTALL a new ambient lighting switch. REFER to «Ambient Lighting Switch»(ref-291888-S16199130792008073000000) . TEST the system for normal operation.
5. K5 CHECK CIRCUIT CBX07 (GN/RD) FOR AN OPEN (TO THE AMBIENT LIGHTING SWITCH) Disconnect: Ambient Lighting Switch C3250 Measure the voltage between the ambient lighting switch C3250-2, circuit CBX07 (GN/RD), harness side and ground. Is the voltage greater than 10 volts? YES : Go to K6 . NO : REPAIR the circuit. TEST the system for normal operation.
6. K6 CHECK THE AMBIENT LIGHTING SWITCH Connect: Ambient Lighting Module C3251 Connect and remove a fused jumper wire between the ambient lighting switch C3250-2, circuit CBX07 (GN/RD), harness side and the ambient lighting switch C3250-6, circuit CBX07 (GN/RD), harness side. Do the ambient lighting LEDs illuminate and cycle through a color change each time the jumper wire is connected and removed? YES : INSTALL a new ambient lighting switch. REFER to «Ambient Lighting Switch»(ref-291888-S16199130792008073000000) . TEST the system for normal operation. NO : REPAIR circuit CLN54 (BN/YE) for an open. TEST the system for normal operation.
7. K7 CHECK THE AMBIENT LIGHTING HARNESS Key in OFF position. Check the diode circuits between the ambient lighting module, harness side as follows: Connector-Pin/Circuit Connector-Pin/Circuit C3251-5 CLN45 (GN) C3251-4 RLN44 (BN) C3251-6 CLN45 (GN) C3251-4 RLN44 (BN) C3251-7 CLN44 (OG) C3251-4 RLN44 (BN) Does the meter indicate that each circuit is OK? YES : Go to K8 . NO : INSTALL a new ambient lighting harness. TEST the system for normal operation.
8. K8 CHECK FOR CORRECT AMBIENT LIGHTING MODULE OPERATION Connect: Ambient Lighting Switch C3250 Disconnect the ambient lighting module connector. Check for: corrosion damaged pins pushed-out pins Connect the ambient lighting module connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new ambient lighting module. REFER to «Ambient Lighting Module»(ref-291888-S17696883302008073000000) . TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test L: The Ambient Lighting Does Not Cycle Through All Color Combinations

Refer to SYSTEM WIRING DIAGRAMS article for Fusion, SYSTEM WIRING DIAGRAMS article for Milan or SYSTEM WIRING DIAGRAMS article for MKZ, Interior Lamps for schematic and connector information.

1. L1 CHECK THE INPUT FROM CIRCUIT CLN54 (BN/YE) Key in OFF position. Disconnect: Ambient Lighting Module C3251 Key in ON position. While pressing and releasing the ambient lighting switch, measure the voltage between the ambient lighting module C3251-2, circuit CLN54 (BN/YE), harness side and ground. Is the voltage greater than 10 volts with the switch pressed, and 0 volts with the switch released? YES : Go to L2 . NO : If voltage is always present, go to L3 . If no voltage is present, go to L4 .
2. L2 CHECK THE AMBIENT LIGHTING HARNESS Key in OFF position. Check the diode circuits between the ambient lighting module, harness side as follows: Connector-Pin/Circuit Connector-Pin/Circuit C3251-5 CLN45 (GN) C3251-4 RLN44 (BN) C3251-6 CLN45 (GN) C3251-4 RLN44 (BN) C3251-7 CLN44 (OG) C3251-4 RLN44 (BN) Does the meter indicate that each circuit is OK? YES : Go to L6 . NO : REPAIR or INSTALL a new ambient lighting harness. TEST the system for normal operation.
3. L3 CHECK CIRCUIT CLN54 (BN/YE) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: Ambient Lighting Switch C3250 Key in ON position. Measure the voltage between the ambient lighting module C3251-2, circuit CLN54 (BN/YE), harness side and ground. Is any voltage present? YES : REPAIR the circuit. TEST the system for normal operation. NO : INSTALL a new ambient lighting switch. REFER to «Ambient Lighting Switch»(ref-291888-S16199130792008073000000) . TEST the system for normal operation.
4. L4 CHECK CIRCUIT CPX07 (GN/RD) FOR AN OPEN (TO THE AMBIENT LIGHTING SWITCH) Key in OFF position. Disconnect: Ambient Lighting Switch C3250 Key in ON position. Measure the voltage between the ambient lighting switch C3250-2, circuit CBX07 (GN/RD), harness side and ground. Is the voltage greater than 10 volts? YES : Go to L5 . NO : REPAIR the circuit. TEST the system for normal operation.
5. L5 CHECK THE AMBIENT LIGHTING SWITCH Connect: Ambient Lighting Module C3251 Connect and remove a fused jumper wire between the ambient lighting switch C3250-2, circuit CBX07 (GN/RD), harness side and the ambient lighting switch C3250-6, circuit CLN54 (BN/YE), harness side. Do the ambient lighting LEDs illuminate and cycle through a color change each time the jumper wire is connected and removed? YES : INSTALL a new ambient lighting switch. REFER to «Ambient Lighting Switch»(ref-291888-S16199130792008073000000) . TEST the system for normal operation. NO : REPAIR circuit CLN54 (BN/YE) for an open. TEST the system for normal operation. TEST the system for normal operation.
6. L6 CHECK FOR CORRECT AMBIENT LIGHTING MODULE OPERATION Connect: Ambient Lighting Switch C3250 Disconnect the ambient lighting module connector. Check for: corrosion damaged pins pushed-out pins Connect the ambient lighting module connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new ambient lighting module. REFER to «Ambient Lighting Module»(ref-291888-S17696883302008073000000) . TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Scheme 14