Interior Lighting Lincoln Zephyr US

The interior lighting system consists of the following components

1. Smart junction box (SJB)
2. Dimmer control switch
3. Interior/map lamps
4. Luggage compartment lamp
5. Vanity mirror lamps
6. Door ajar switches

The interior lighting system consists of 2 subsystems

1. Courtesy lamps
2. Demand lamps

The courtesy lamps are controlled by the SJB. The SJB supplies voltage to the courtesy lamps. The courtesy lamp subsystem consists of the interior dome lamps, the overhead console lamps (if equipped), and the puddle lamps (if equipped).

The demand lamps are controlled by the SJB. The SJB supplies voltage to the demand lamps. The demand lamps subsystem consists of the luggage compartment lamp, front map lamps, and the left and right vanity mirror lamps.

The SJB supplies power to the interior lighting system. The SJB will set DTCs if certain circuit failures exist with the interior lighting system.

Refer to appropriate SYSTEM WIRING DIAGRAMS for schematic and connector information.

SPECIAL TOOL CHART 73III Automotive Meter 105-R0057 or equivalent Worldwide Diagnostic System (WDS) Vehicle Communication Module (VCM) with appropriate adapters, or equivalent diagnostic tool

Principles of Operation

The smart junction box (SJB) supplies voltage to the interior lighting system. The interior lighting system illuminates the courtesy lamps to enhance visibility of the interior while a vehicle door is open or ajar, and the vehicle speed is less than 15 km/h (9 mph). The SJB controls all interior lighting functions and timing by monitoring inputs from the door ajar switches and vehicle speed.

The interior lighting delay feature provides temporary illumination of the courtesy lamps after the doors are opened and then closed. The interior lighting delay feature will keep the courtesy lamps on for a period of 25 seconds. If during the 25 second delay time the SJB detects that the ignition has been turned ON, or if the vehicle is locked using the remote keyless entry (RKE) transmitter or the keypad, the courtesy lamp illumination will be discontinued.

Illuminated Entry

The illuminated entry requests the courtesy lamps to be illuminated when the ignition is OFF and either the RKE transmitter UNLOCK button is pressed, or the vehicle is unlocked using the keypad. The illuminated entry requests the courtesy lamps off after 25 seconds have elapsed, the ignition is switched to ON, the RKE transmitter LOCK button is pressed, or the vehicle is locked using the keypad.

Illuminated Exit

The illuminated exit requests the courtesy lamps be illuminated for 25 seconds when all doors are closed and the ignition key is removed from the ignition lock cylinder. The illuminated exit will request the courtesy lamps be deactivated when the ignition key is inserted into the ignition lock cylinder, or 25 seconds have elapsed.

Theater Lighting

The theater lighting option ramps-up the courtesy lamps over 0.7 seconds when courtesy lamp activation is requested. The theater lighting feature ramps-down the courtesy lamps over 1.7 seconds when interior lighting deactivation is requested by any feature other than the panic alarm or battery saver.

Interior Lamp Arbitrator

The interior lamp arbitrator (located in the SJB) chooses between the interior lighting, interior mode, interior lighting delay, illuminated entry, illuminated exit and battery saver to determine which feature has precedence of activating and deactivating the interior lamps. The features are prioritized as follows: battery saver, interior mode, interior lighting, interior light delay, illuminated entry, and illuminated exit.

Battery Saver

The battery saver is internal to the SJB and provides automatic shutoff of the demand lamps (vanity lamps, map lamps and glove compartment lamp) and courtesy lamps after a period of 30 minutes (10 minutes if the lights are on due to a door ajar) has elapsed in order to save battery voltage. A timer in the SJB starts when the ignition is turned to the OFF position. When the time-out period for the lamps has elapsed, the voltage is automatically shutoff to the lamps by the battery saver. While the battery saver has voltage disabled, if the ignition is turned to any position other than OFF, a door becomes ajar, the UNLOCK button of the RKE transmitter is pressed, or the keypad is used to lock the vehicle, the battery saver will restore voltage and start the timer again.

Inspection and Verification

1. Verify the customer concern.
2. Visually inspect the following 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 Smart junction box (SJB) fuse 3 (15A) Circuitry Courtesy lamps Map lamps Luggage compartment lamp Vanity lamps Glove compartment lamp 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 diagnostic tool to the data link connector (DLC) 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 diagnostic tool data link test. If the diagnostic tool responds with: CAN or UBP circuits fault; all electronic control units no response/not equipped, refer to «MODULE COMMUNICATIONS NETWORK»(/lincoln/zephyr/us-2006-2006/remont/communication-devices/#module-communications-network) . No response/not equipped for the SJB, refer to «MULTIFUNCTION ELECTRONIC CONTROL MODULES»(/lincoln/zephyr/us-2006-2006/remont/communication-devices/#multifunction-electronic-control-modules) . System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out the self-test diagnostics for the SJB.
7. If the DTCs retrieved are related to the concern, go to the «SMART JUNCTION BOX (SJB) DIAGNOSTIC TROUBLE CODE (DTC) INDEX»(/lincoln/zephyr/us-2006-2006/remont/interiorillumination-lights/#interior-lighting) .
8. If no DTCs related to the concern are retrieved, GO to «SYMPTOM CHART»(/lincoln/zephyr/us-2006-2006/remont/interiorillumination-lights/#interior-lighting__symptom-chart) .

SMART JUNCTION BOX (SJB) DIAGNOSTIC TROUBLE CODE (DTC) INDEX

Symptom Chart

SYMPTOM CHART

Normal Operation

Power is supplied to the courtesy lamps through the smart junction box (SJB) fuse 3 (15A), which supplies voltage to the courtesy lamps/demand lamps solid-state relay in the SJB. When any door is opened, the ajar switch opens, signaling the SJB. The SJB monitors the ajar circuits, and based on the ajar status, the SJB will energize the solid-state relay supplying voltage to the courtesy lamps on circuit CLN26 (BU). Ground for the courtesy lamps is supplied through circuit GD139 (BK/YE).

Possible Causes

1. Fuse
2. Circuit CLN09 (YE/GN) short to ground
3. Circuit CLN26 (BU) open or short to ground
4. SJB

Scheme 1

Scheme 2

Scheme 3

1. A1 CHECK THE OPERATION OF THE DEMAND LIGHTING Operate the demand lighting function on one interior lamp. Does the demand lighting operate correctly? Yes : GO to A2. No : GO to A3 .
2. A2 CHECK CIRCUIT CLN26 (BU) FOR AN OPEN Key in OFF position. Disconnect: SJB C2280e. Connect a fused (15A) jumper wire between the SJB C2280e-16, circuit CLN26 (BU), harness side and battery positive. Do the courtesy lamps illuminate? Yes : VERIFY the SJB fuse 3 (15A) is OK. If OK, GO to A5 . No : REPAIR the circuit. TEST the system for normal operation.
3. A3 CHECK CIRCUIT CLN26 (BU) FOR A SHORT TO GROUND Key in OFF position. Disconnect: SJB C2280e. NOTE: If the fuse fails, repair circuit CLN26 (BU) for a short to ground. Connect a fused (15A) jumper wire between the SJB C2280e-16, circuit CLN26 (BU), harness side and battery positive. Do the courtesy lamps illuminate? Yes : GO to A4. No : REPAIR the circuit. TEST the system for normal operation.
4. A4 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 (15A) jumper wire between the SJB C2280e-2, circuit CLN09 (YE/GN), harness side and battery positive. Do the demand lamps illuminate? Yes : VERIFY the SJB fuse 3 (15A) is OK. If OK, GO to A5. No : REPAIR the circuit. TEST the system for normal operation.
5. A5 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: Corrosion 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 CONTROL MODULES»(/lincoln/zephyr/us-2006-2006/remont/communication-devices/#multifunction-electronic-control-modules) . 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.

The smart junction box (SJB) provides voltage to the courtesy lamps on circuit CLN26 (BU). The courtesy lamps are grounded through circuit GD139 (BK/YE). The luggage compartment lamp is also on the courtesy lamp circuit. Circuit CLN26 (BU) provides voltage to the luggage compartment lamp, and the lamp is grounded through circuit GD171 (BK/RD).

1. Circuit CLN26 (BU) open
2. Circuit GD139 (BK/YE) open
3. Circuit GD171 (BK/GY) open
4. Interior lamp

PINPOINT TEST B: AN INDIVIDUAL COURTESY LAMP IS INOPERATIVE

1. B1 CHECK THE INTERIOR LAMP Key in OFF position. Disconnect: Suspect Interior Lamp. Open the driver door. Measure the voltage between the suspect interior lamp connector pins, harness side as follows: CONNECTOR-PIN SPECIFICATION Location Connector-Pin/Circuit Connector-Pin/Circuit Front interior lamp C904-1 CLN26 (BU) C904-2 GD139 (BK/YE) Rear interior lamp C901-1 CLN26 (BU) C901-2 GD139 (BK/YE) Dome lamp (Fusion without moonroof) C918-1 CLN26 (BU) C918-2 GD139 (BK/YE) Luggage compartment lamp C918-1 CLN26 (BU) C4198-2 GD171 (BK/GY) Is the voltage greater than 10 volts? Yes : INSTALL a new interior lamp for the lamp in question. TEST the system for normal operation. No : GO to B2.
2. B2 CHECK CIRCUIT CLN26 (BU) FOR VOLTAGE Measure the voltage between the suspect interior lamp, circuit CLN26 (BU), harness side and ground as follows: CONNECTOR-PIN SPECIFICATION Location Connector-Pin Front interior lamp C904-1 Rear interior lamp C901-1 Dome lamp (Fusion without moonroof) C918-1 Luggage compartment lamp C4198-1 Is the voltage greater than 10 volts? Yes : REPAIR circuit GD139 (BK/YE) or GD171 (BK/RD) 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.

When any door is open, the ajar switch opens the circuit to the smart junction box (SJB). In contrast, when the luggage compartment lid is opened, the switch closes the circuit to the SJB. The SJB monitors the ajar circuits, and based on the ajar status, the SJB will supply voltage to the courtesy lamps on circuit CLN26 (BU).

1. Circuit CLN26 (BU) short to voltage
2. Circuit CLN28 (GN/BU) short to ground
3. Circuit CPL26 (GN/VT) open
4. Circuit CPL31 (WH) open
5. Circuit CPL36 (GN) open
6. Circuit CPL39 (YE) open
7. Circuit CPL44 (YE/OG) short to ground
8. Circuit GD126 (BK/WH) open
9. Circuit GD139 (BK/YE) open
10. Circuit GD171 (BK/GY) open
11. Dimmer control switch
12. Door ajar switch
13. Luggage compartment lid ajar switch
14. SJB

Scheme 4

Scheme 5

1. C1 CHECK THE SJB DIAGNOSTIC TROUBLE CODES (DTCs) FROM BOTH CONTINUOUS AND ON-DEMAND SELF-TESTS Use the recorded results from the SJB continuous and on-demand self-test. Are any DTCs recorded? Yes : For DTCs B1320, B1328, B1336 or B1572, GO to C3 . For DTC B1331, GO to C10 . For all other DTCs, REFER to the «SMART JUNCTION BOX (SJB) DIAGNOSTIC TROUBLE CODE (DTC) INDEX»(/lincoln/zephyr/us-2006-2006/remont/interiorillumination-lights/#interior-lighting) . No : GO to C2.
2. C2 CHECK THE DOOR AJAR PIDs Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Diagnostic PID Data Monitor. Check the door ajar PIDs while opening and closing all the doors and the luggage compartment lid. Do all the door ajar and the luggage compartment lid ajar PID values agree with the door and the luggage compartment lid positions? Yes : GO to C6 . No : For the door ajar switches, GO to C3. For the luggage compartment lid ajar switch, GO to C10 .
3. C3 CHECK THE DOOR AJAR SWITCH GROUND CIRCUIT FOR AN OPEN Key in OFF position. Disconnect: Suspect Door Ajar Switch. Measure the resistance between the suspect door ajar switch, harness side and ground as follows: CONNECTOR-PIN SPECIFICATION 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) Is the resistance less than 5 ohms? Yes : GO to C4. No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
4. C4 CHECK THE DOOR AJAR SWITCH OPERATION Measure the resistance between the suspect door ajar switch pins, component side, while toggling the switch open and closed as follows: CONNECTOR-PIN SPECIFICATION Location Connector Pins LH front C525 6 and 8 RH front C603 6 and 8 LH rear C704 6 and 8 RH rear C804 6 and 8 Is the resistance less than 5 ohms when the switch is closed and greater than 10,000 ohms when the switch is open? Yes : GO to C5. No : INSTALL a new door ajar switch for the switch in question. REFER to «HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS»(/lincoln/zephyr/us-2006-2006/remont/door-locks-anti-theft-systems/#handles-locks-latches-and-entry-systems) . CLEAR the DTCs. REPEAT the self-test.
5. C5 CHECK THE DOOR AJAR SWITCH CIRCUIT FOR AN OPEN Disconnect: SJB C2280c. Measure the resistance between the suspect door ajar switch, harness side and the SJB, harness side as follows: SJB CONNECTOR-PIN SPECIFICATION Location SJB Connector-Pin Suspect Door 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) Is the resistance less than 5 ohms? Yes : GO to C12 . No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
6. C6 CHECK THE DIMMER CONTROL SWITCH PID Enter the following diagnostic mode on the diagnostic tool: Diagnostic PID Data Monitor. Verify the dimmer control switch is in the OFF position. Does the dome lamp switch PID value agree with the switch position? Yes : GO to C7. No : GO to C8 .
7. C7 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. CLEAR the DTCs. REPEAT the self-test. No : GO to C12 .
8. C8 CHECK THE DIMMER CONTROL SWITCH Key in OFF position. Disconnect: Dimmer Control Switch C2065. Observe the courtesy lamps. Are the courtesy lamps still illuminated? Yes : GO to C9. No : INSTALL a new dimmer control switch. REFER to «EXTERIOR LIGHTING»(/lincoln/zephyr/us-2006-2006/remont/exterior-lights/#exterior-lighting) . CLEAR the DTCs. REPEAT the self-test.
9. C9 CHECK CIRCUIT CLN28 (GN/BU) FOR A SHORT TO GROUND Disconnect: SJB C2080d. Observe the courtesy lamps. Are the courtesy lamps still illuminated? Yes : GO to C12 . No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
10. C10 CHECK CIRCUIT CPL44 (YE/OG) Key in OFF position. Disconnect: SJB C2280c. Verify the luggage compartment lid is closed. Measure the resistance between the SJB C2280c-6, circuit CPL44 (YE/OG), harness side and ground. Is the resistance greater than 10,000 ohms? Yes : GO to C12 . No : GO to C11.
11. C11 CHECK CIRCUIT CPL44 (YE/OG) FOR A SHORT TO GROUND Disconnect: Luggage Compartment Lid Ajar Switch C429. Measure the resistance between the SJB C2280c-6, circuit CPL44 (YE/OG), harness side and ground. Is the resistance greater than 10,000 ohms? Yes : INSTALL a new luggage compartment lid ajar switch. REFER to «HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS»(/lincoln/zephyr/us-2006-2006/remont/door-locks-anti-theft-systems/#handles-locks-latches-and-entry-systems) . CLEAR the DTCs. REPEAT the self-test. No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
12. C12 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: Corrosion 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 CONTROL MODULES»(/lincoln/zephyr/us-2006-2006/remont/communication-devices/#multifunction-electronic-control-modules) . CLEAR the DTCs. REPEAT the self-test. 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.

When any door is open, the ajar switch opens the circuit to the smart junction box (SJB). In contrast, when the luggage compartment lid is opened, the switch closes the circuit to the SJB. The SJB monitors the ajar circuits, and based on the ajar status, the SJB will supply voltage to the courtesy lamps on circuit CLN26 (BU).

1. Circuit CPL26 (GN/VT) short to ground
2. Circuit CPL31 (WH) short to ground
3. Circuit CPL36 (GN) short to ground
4. Circuit CPL39 (YE) short to ground
5. Circuit CPL44 (YE/OG) open
6. Circuit GD171 (BK/GY) open
7. Door ajar switch
8. Luggage compartment lid ajar switch
9. SJB

Scheme 6

Scheme 7

Scheme 8

1. D1 CHECK THE SJB DIAGNOSTIC TROUBLE CODES (DTCs) FROM BOTH CONTINUOUS AND ON-DEMAND SELF-TESTS Verify all the doors and the luggage compartment lid are closed. Use the recorded results from the SJB continuous and on-demand self-test. Are any DTCs recorded? Yes : REFER to «SMART JUNCTION BOX (SJB) DIAGNOSTIC TROUBLE CODE (DTC) INDEX»(/lincoln/zephyr/us-2006-2006/remont/interiorillumination-lights/#interior-lighting) . No : GO to D2.
2. D2 CHECK THE AJAR PIDs Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Diagnostic PID Data Monitor. Check the ajar PIDs while opening and closing all the doors and the luggage compartment lid. Do all the door ajar and the luggage compartment lid ajar PID values agree with the door and the luggage compartment lid positions? Yes : GO to D8 . No : For the door ajar switches, GO to D3. For the luggage compartment lid ajar switch, GO to D5 .
3. D3 CHECK THE DOOR AJAR SWITCH OPERATION Disconnect: Suspect Door Ajar Switch. Measure the resistance between the suspect door ajar switch pins, component side, while toggling the switch open and closed as follows: CONNECTOR PINS SPECIFICATION Location Connector Pins LH front C525 6 and 8 RH front C603 6 and 8 LH rear C704 6 and 8 RH rear C804 6 and 8 Is the resistance less than 5 ohms when the switch is closed and greater than 10,000 ohms when the switch is open? Yes : GO to D4. No : INSTALL a new door ajar switch for the switch in question. REFER to «HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS»(/lincoln/zephyr/us-2006-2006/remont/door-locks-anti-theft-systems/#handles-locks-latches-and-entry-systems) . TEST the system for normal operation.
4. D4 CHECK THE DOOR AJAR SWITCH CIRCUITS FOR A SHORT TO GROUND Disconnect: SJB C2280c. Measure the resistance between the suspect door ajar switch, harness side and ground as follows: CONNECTOR-PIN SPECIFICATION Location 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) Is the resistance greater than 10,000 ohms? Yes : GO to D8 . No : REPAIR the circuit in question. TEST the system for normal operation.
5. D5 CHECK CIRCUIT GD171 (BK/GY) FOR AN OPEN Key in OFF position. Disconnect: Luggage Compartment Lid Ajar Switch C429. Measure the resistance between the luggage compartment lid ajar switch C429-3, circuit GD171 (BK/GY), harness side and ground. Is the resistance less than 5 ohms? Yes : GO to D6. No : REPAIR the circuit in question. TEST the system for normal operation.
6. D6 CHECK THE LUGGAGE COMPARTMENT LID AJAR SWITCH OPERATION Measure the resistance between the luggage compartment lid ajar switch connector C429 pins 1 and 3 component side, while toggling the switch open and closed. Is the resistance less than 5 ohms when the switch is closed and greater than 10,000 ohms when the switch is open? Yes : GO to D7. No : INSTALL a new luggage compartment lid ajar switch. REFER to «HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS»(/lincoln/zephyr/us-2006-2006/remont/door-locks-anti-theft-systems/#handles-locks-latches-and-entry-systems) . TEST the system for normal operation.
7. D7 CHECK CIRCUIT CPL44 (YE/OG) FOR AN OPEN Disconnect: SJB C2280c. Measure the resistance between the SJB C2280c-6, circuit CPL44 (YE/OG), harness side and the luggage compartment lid ajar switch C429-1, circuit CPL44 (YE/OG), harness side. Is the resistance less than 5 ohms? Yes : GO to D8. No : REPAIR the circuit. TEST the system for normal operation.
8. D8 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: Corrosion 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 CONTROL MODULES»(/lincoln/zephyr/us-2006-2006/remont/communication-devices/#multifunction-electronic-control-modules) . 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.

The smart junction box (SJB) supplies voltage to the demand lamps on circuit CLN09 (YE/GN). The demand lamps are grounded through circuit GD139 (BK/YE). The glove compartment lamp (Zephyr only) is case grounded.

1. Circuit CLN09 (YE/GN) open or short to ground
2. SJB

Scheme 9

1. E1 CHECK THE OPERATION OF THE COURTESY LAMPS Key in ON position. Operate the courtesy lamps. Do the courtesy lamps illuminate? Yes : GO to E2. No : GO to «PINPOINT TEST A»(/lincoln/zephyr/us-2006-2006/remont/interiorillumination-lights/#interior-lighting) .
2. E2 CHECK CIRCUIT CLN09 (YE/GN) FOR AN OPEN Key in OFF position. Disconnect: SJB 2280e. Connect a fused (15A) jumper wire between the SJB C2280e-2, circuit CLN09 (YE/GN), harness side and battery positive. Do the demand lamps illuminate? Yes : GO to E3. No : REPAIR the circuit. TEST the system for normal operation.
3. E3 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: Corrosion 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 CONTROL MODULES»(/lincoln/zephyr/us-2006-2006/remont/communication-devices/#multifunction-electronic-control-modules) . 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.

The smart junction box (SJB) supplies voltage to the demand lamps on circuit CLN09 (YE/GN). The demand lamps are grounded through circuit GD139 (BK/YE). The glove compartment lamp (Zephyr only) is case grounded.

1. Circuit CLN09 (YE/GN) open
2. Circuit GD139 (BK/YE) open
3. Interior lamp

PINPOINT TEST F: AN INDIVIDUAL DEMAND LAMP IS INOPERATIVE

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: CONNECTOR-PIN SPECIFICATION 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 C904-3 CLN09 (YE/GN) Rear interior lamp C901-3 CLN09 (YE/GN) Dome lamp (Fusion without moonroof) C918-3 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: CONNECTOR-PIN SPECIFICATION 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 C904-2 GD139 (BK/YE) Rear interior lamp C901-2 GD139 (BK/YE) Dome lamp (Fusion without moonroof) C918-2 GD139 (BK/YE) Glove compartment lamp Case ground - Is the resistance less than 5 ohms? Yes : INSTALL a new demand lamp for the lamp in question. TEST the system for normal operation. No : REPAIR the circuit in question. TEST the system for normal operation.

The illuminated entry provides interior lighting whenever the smart junction box (SJB) receives a doors unlock request from the RKE transmitter. The SJB provides voltage on circuit CLN26 (BU) for the courtesy lamps.

1. RKE system
2. SJB

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»(/lincoln/zephyr/us-2006-2006/remont/door-locks-anti-theft-systems/#handles-locks-latches-and-entry-systems) to continue diagnosis of the RKE system.
2. G2 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: Corrosion 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 CONTROL MODULES»(/lincoln/zephyr/us-2006-2006/remont/communication-devices/#multifunction-electronic-control-modules) . 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.

The smart junction box (SJB) provides a battery saver function. The battery saver function provides automatic shutoff of the interior lamps (courtesy lamps and demand lamps) after a predetermined time has elapsed in order to save battery power.

1. Circuit CLN26 (BU) short to voltage
2. Circuit CLN09 (YE/GN) short to voltage
3. STR

PINPOINT TEST H: THE BATTERY SAVER DOES NOT DEACTIVATE AFTER TIME-OUT

1. H1 CHECK CIRCUIT CLN26 (BU) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: SJB 2280e. Key in ON position. Observe the courtesy lamps. Do the courtesy lamps illuminate? Yes : REPAIR the circuit. TEST the system for normal operation. No : GO to H2.
2. H2 CHECK CIRCUIT CLN09 (YE/GN) FOR A SHORT TO VOLTAGE Operate the demand lamps. Do the demand lamps illuminate? Yes : REPAIR the circuit. TEST the system for normal operation. No : GO to H3.
3. H3 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: Corrosion 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 CONTROL MODULES»(/lincoln/zephyr/us-2006-2006/remont/communication-devices/#multifunction-electronic-control-modules) . 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.

The smart junction box (SJB) provides voltage to the puddle lamps through circuit CLN26 (BU). The puddle lamps have separate ground circuits. The LH exterior mirror is grounded through circuit GD126 (BK/WH), and the RH exterior mirror is grounded through circuit GD139 (BK/YE).

1. Circuit CLN26 (BU) open
2. Circuit GD126 (BK/WH) open
3. Circuit GD139 (BK/YE) open
4. Exterior mirror

PINPOINT TEST I: THE PUDDLE LAMPS ARE INOPERATIVE

1. I1 CHECK THE COURTESY LAMP OPERATION Operate the courtesy lamps. Do the courtesy lamps illuminate? Yes : GO to I2. No : GO to «PINPOINT TEST A»(/lincoln/zephyr/us-2006-2006/remont/interiorillumination-lights/#interior-lighting) .
2. I2 CHECK CIRCUIT CLN26 (BU) FOR AN OPEN Observe the puddle lamps. Are both the puddle lamps inoperative? Yes : REPAIR the circuit. TEST the system for normal operation. No : GO to I3.
3. I3 CHECK CIRCUIT CLN26 (BU) FOR VOLTAGE Disconnect: Suspect Exterior Mirror. NOTE: The courtesy lamps must be illuminated during this test. Measure the voltage between the suspect exterior mirror, harness side and ground as follows: CONNECTOR-PIN SPECIFICATION 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 I4. No : REPAIR the circuit in question. TEST the system for normal operation.
4. I4 CHECK THE GROUND CIRCUIT FOR AN OPEN Measure the resistance between the suspect exterior mirror, harness side and ground as follows: CONNECTOR-PIN SPECIFICATION Location Connector-Pin Circuit RH exterior mirror (without memory) C625-4 GD139 (BK/YE) RH exterior mirror (with memory) C626-7 GD139 (BK/YE) LH exterior mirror (without memory) C517-4 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 mirror in question. TEST the system for normal operation. No : REPAIR the circuit in question. TEST the system for normal operation.

The smart junction box (SJB) monitors the dimmer control switch status on circuit CLN28 (GN/BU) to determine if the courtesy lamps are requested. Based on the dimmer control switch status, the SJB supplies voltage to the courtesy lamps through circuit CLN26 (BU).

1. Circuit CLN28 (GN/BU) open or short to ground
2. Dimmer control switch
3. SJB

Scheme 10

Scheme 11

Scheme 12

Scheme 13

1. J1 CHECK THE SJB DIAGNOSTIC TROUBLE CODES (DTCs) FROM BOTH CONTINUOUS AND ON-DEMAND SELF-TESTS Use the recorded results from the SJB continuous and on-demand self-test. Are any DTCs recorded? Yes : For DTC B1688, GO to J4 . For DTC B1247, REFER to «INSTRUMENT CLUSTER AND PANEL ILLUMINATION»(/lincoln/zephyr/us-2006-2006/remont/gauges-instrument-panels/#instrument-cluster-and-panel-illumination) to continue diagnosis of the backlighting. For all other DTCs, REFER to «SMART JUNCTION BOX (SJB) DIAGNOSTIC TROUBLE CODE (DTC) INDEX»(/lincoln/zephyr/us-2006-2006/remont/interiorillumination-lights/#interior-lighting) . No : GO to J2.
2. J2 CHECK THE DIMMER CONTROL SWITCH Key in OFF position. Disconnect: Dimmer Control Switch C2065. Connect a fused (10A) jumper wire between the dimmer control switch C2065-2, circuit CLN28 (GN/BU), harness side and the dimmer control switch C2065-4, circuit CLN27 (WH/BN), harness side. Do the courtesy lamps illuminate? Yes : INSTALL a new dimmer control switch. REFER to «EXTERIOR LIGHTING»(/lincoln/zephyr/us-2006-2006/remont/exterior-lights/#exterior-lighting) . TEST the system for normal operation. No : GO to J3.
3. J3 CHECK CIRCUIT CLN28 (GN/BU) FOR AN OPEN Disconnect: SJB C2280d. Measure the resistance between the SJB C2280d-26, circuit CLN28 (GN/BU), harness side and the dimmer control switch C2065-2, circuit CLN28 (GN/BU), harness side. Is the resistance less than 5 ohms? Yes : GO to J6 . No : REPAIR the circuit. TEST the system for normal operation.
4. J4 CHECK CIRCUIT CLN28 (GN/BU) FOR A SHORT TO GROUND Key in OFF position. Disconnect: SJB C2280d. Disconnect: Dimmer Control Switch C2065. Measure the resistance between the SJB C2080d-26, circuit CLN28 (GN/BU), harness side and ground. Is the resistance greater than 10,000 ohms? Yes : GO to J5. No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
5. J5 CHECK THE DIMMER CONTROL SWITCH Connect: Dimmer Control Switch C2065. NOTE: The dimmer control switch must be in the OFF position. Measure the resistance between the SJB C2080d-26, circuit CLN28 (GN/BU), harness side and ground. Is the resistance greater than 10,000 ohms? Yes : GO to J6. No : INSTALL a new dimmer control switch. REFER to «EXTERIOR LIGHTING»(/lincoln/zephyr/us-2006-2006/remont/exterior-lights/#exterior-lighting) . CLEAR the DTCs. REPEAT the self-test.
6. J6 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: Corrosion 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 CONTROL MODULES»(/lincoln/zephyr/us-2006-2006/remont/communication-devices/#multifunction-electronic-control-modules) . CLEAR the DTCs. REPEAT the self-test. 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.

Scheme 14

Removal and Installation

1. Open the overhead console storage door to access the screws. Remove the 2 screws.
2. Pull the overhead console down and remove the console from the headliner retainer. Disconnect the electrical connector.
3. To install, reverse the removal procedure.

Scheme 15

Scheme 16

Scheme 17

1. Remove the rear interior lamp lens.
2. Release the 2 retaining clips (through the access holes) and remove the rear interior lamp assembly. Disconnect the electrical connector.
3. To install, reverse the removal procedure.

See also:
• MODULE COMMUNICATIONS NETWORK
• MULTIFUNCTION ELECTRONIC CONTROL MODULES
• HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS
• EXTERIOR LIGHTING
• INSTRUMENT CLUSTER AND PANEL ILLUMINATION
• SMART JUNCTION BOX (SJB) DIAGNOSTIC TROUBLE CODE (DTC) INDEX
• SYMPTOM CHART
• PINPOINT TEST B
• PINPOINT TEST F
• PINPOINT TEST G
• PINPOINT TEST H
• PINPOINT TEST I