| Diagnosis and Testing Refer to Wiring Diagrams Section 417-02, for schematic and connector information. Inspection and Verification - Verify the customer concern.
- Visually inspect for obvious signs of electrical damage.
Visual Inspection Chart | Electrical | | Fuse(s) | | Transportation fuse pack | | Wiring harness | | Electrical connector(s) | | Lamp(s) | | Switch(es) | | Generic Electronic Module (GEM) | - If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- If the cause is not visually evident, verify the symptom and refer to the Symptom Chart.
Symptom Chart | Symptom | Possible Sources | Action | | The front interior lamp is inoperative | * Fuse. * Bulb. * Circuit(s). * Interior lamp switch. * Front interior lamp. * GEM. | * | | The rear interior lamp is inoperative (Fusion only) | * Fuse. * Bulb. * Circuit(s). * Interior lamp switch. * Rear interior lamp. * GEM. | * | | Right-hand rear map reading lamp is inoperative (Fusion only) | * Fuse. * Bulb. * Circuit(s). * Map reading lamp. * GEM. | * | | Left-hand rear map reading lamp is inoperative (Fusion only) | * Fuse. * Bulb. * Circuit(s). * Map reading lamp. * GEM. | * | | The luggage compartment lamp is inoperative | * Fuse. * Bulb. * Circuit(s). * Luggage compartment lamp switch. * Luggage compartment lamp. * GEM. | * | | The interior lamp does not automatically turn off after 10 minutes when the lamp is in the ILLUMINATED ENTRY position | * GEM. * Circuit. | * CHECK circuit 31S-LC7 (BK/BU) for short to ground. If the circuit is OK, INSTALL a new GEM.
REFER to: Generic Electronic Module (GEM) (419-10 Multifunction Electronic Modules, Removal and Installation).
TEST the system for normal operation. | | The interior lamp does not automatically turn off after 30 minutes when the lamp is in the ON position | * GEM. | * INSTALL a new GEM.
REFER to: Generic Electronic Module (GEM) (419-10 Multifunction Electronic Modules, Removal and Installation).
TEST the system for normal operation. | Pinpoint Tests NOTE:Use a digital multimeter for all electrical measurements. | PINPOINT TEST A : THE FRONT INTERIOR LAMP IS INOPERATIVE | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | A1: CHECK THE OPERATION OF THE FRONT INTERIOR LAMP | | | 1 Check the operation of the front interior lamp in both the ON and ILLUMINATED ENTRY positions. | | | Is the front interior lamp inoperative in both positions? Yes No If inoperative in the ON position, GO to A3. If inoperative in the ILLUMINATED ENTRY position, GO to A4. | | A2: CHECK THE FRONT INTERIOR LAMP FOR POWER | | | 1 Disconnect Front Interior Lamp C750. | | | 2 Ignition switch in position II. | | | 3 Ignition switch in position 0. | | | 4 Measure the voltage between the front interior lamp C750 pin 1, circuit 29-LC7 (OG/BU), harness side and ground. | | | Is the voltage greater than 10 volts? Yes No REPAIR circuit 29-LC7 (OG/BU). TEST the system for normal operation. | | A3: CHECK THE FRONT INTERIOR LAMP FOR GROUND | | | 1 Disconnect Front Interior Lamp C751. | | | 2 Measure the resistance between the front interior lamp C751 pin 2, 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. | | A4: CHECK THE FRONT INTERIOR LAMP FOR GROUND WITH THE DRIVER DOOR OPEN | | | 1 Disconnect Front Interior Lamp C751. | | | 2 Open the driver door. | | | 3 Measure the resistance between the front interior lamp C751 pin 1, 31S-LC7 (BK/BU), 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 | | A5: CHECK CIRCUIT 31S-LC7 FOR OPEN CIRCUIT | | | 1 Disconnect GEM C316. | | | 2 Measure the resistance between the front interior lamp C751 pin 1, 31S-LC7 (BK/BU), harness side and the GEM C316 pin 21, circuit 31S-LC7 (BK/BU), harness side. CHECK | | | Is the resistance less than 5 ohms? Yes INSTALL a new GEM.
REFER to: Generic Electronic Module (GEM) (419-10 Multifunction Electronic Modules, Removal and Installation).
TEST the system for normal operation. No REPAIR the circuit. TEST the system for normal operation. | | PINPOINT TEST B : THE REAR INTERIOR LAMP IS INOPERATIVE (FUSION ONLY) | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | B1: CHECK THE OPERATION OF THE REAR INTERIOR LAMP | | | 1 Check the operation of the rear interior lamp in both the ON and ILLUMINATED ENTRY positions. | | | Is the rear interior lamp inoperative in both positions? Yes No If inoperative in the ON position, GO to B3. If inoperative in the ILLUMINATED ENTRY position, GO to B4. | | B2: CHECK THE REAR INTERIOR LAMP FOR POWER | | | 1 Disconnect Rear Interior Lamp C752. | | | 2 Ignition switch in position II. | | | 3 Ignition switch in position 0. | | | 4 Measure the voltage between the rear interior lamp C752 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 REAR INTERIOR LAMP FOR GROUND | | | 1 Disconnect Rear Interior Lamp C753. | | | 2 Measure the resistance between the rear interior lamp C753 pin 2, 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. | | B4: CHECK THE REAR INTERIOR LAMP FOR GROUND WITH THE DRIVER DOOR OPEN | | | 1 Disconnect Rear Interior Lamp C753. | | | 2 Open the driver door. | | | 3 Measure the resistance between the rear interior lamp C753 pin 1, 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 | | B5: CHECK CIRCUIT 31S-LC17 (BK/YE) AND CIRCUIT 31S-LC7 (BK/BU) FOR OPEN CIRCUIT | | | 1 Disconnect GEM C316. | | | 2 Measure the resistance between the rear interior lamp C753 pin 1, 31S-LC17 (BK/YE), harness side and the GEM C316 pin 3, circuit 31S-LC7 (BK/BU), harness side. | | | Is the resistance less than 5 ohms? Yes INSTALL a new GEM.
REFER to: Generic Electronic Module (GEM) (419-10 Multifunction Electronic Modules, Removal and Installation).
TEST the system for normal operation. No REPAIR circuit 31S-LC17 (BK/YE) or circuit 31SLC7 (BK/BU) as necessary. TEST the system for normal operation. | | PINPOINT TEST C : RIGHT-HAND REAR MAP READING LAMP IS INOPERATIVE (FUSION ONLY) | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | C1: CHECK THE RIGHT-HAND REAR MAP READING LAMP FOR POWER | | | 1 Disconnect Right-Hand Rear Map Reading Lamp C490. | | | 2 Measure the voltage between the right-hand rear map reading lamp C490 pin 1, circuit 29-LB21 (OG/BK), harness side and ground. | | | Is the voltage greater than 10 volts? Yes No REPAIR circuit 29-LB21 (OG/BK). TEST the system for normal operation. | | C2: CHECK THE RIGHT-HAND REAR MAP READING LAMP FOR GROUND | | | 1 Measure the resistance between the right-hand rear map reading lamp C490 pin 3, 31-LB21 (BK), harness side and ground. | | | Is the resistance less than 5 ohms? Yes INSTALL a new right-hand rear map reading lamp. TEST the system for normal operation. No REPAIR circuit 31-LB21 (BK). TEST the system for normal operation. | | PINPOINT TEST D : LEFT-HAND REAR MAP READING LAMP IS INOPERATIVE (FUSION ONLY) | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | D1: CHECK THE LEFT-HAND REAR MAP READING LAMP FOR POWER | | | 1 Disconnect Left-Hand Rear Map Reading Lamp C491. | | | 2 Measure the voltage between the left-hand rear map reading lamp C491 pin 1, circuit 29-LB14 (OG), harness side and ground. | | | Is the voltage greater than 10 volts? Yes No REPAIR circuit 29-LB14 (OG). TEST the system for normal operation. | | D2: CHECK THE LEFT-HAND REAR MAP READING LAMP FOR GROUND | | | 1 Measure the resistance between the left-hand rear map reading lamp C491 pin 3, 31-LB14 (BK), harness side and ground. | | | Is the resistance less than 5 ohms? Yes INSTALL a new left-hand rear map reading lamp. TEST the system for normal operation. No REPAIR circuit 31-LB14 (BK). TEST the system for normal operation. | | PINPOINT TEST E : THE LUGGAGE COMPARTMENT LAMP IS INOPERATIVE | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | E1: CHECK THE LUGGAGE COMPARTMENT LAMP FOR POWER | | | 1 Disconnect Luggage Compartment Lamp C576. | | | 2 Ignition switch in position II. | | | 3 Ignition switch in position 0. | | | 4 Measure the voltage between the luggage compartment lamp C576 pin 1, circuit 29-LB25 (OG/BU), harness side and ground. | | | Is the voltage greater than 10 volts? Yes No REPAIR circuit 29-LB25 (OG/BU). TEST the system for normal operation. | | E2: CHECK THE LUGGAGE COMPARTMENT LAMP FOR GROUND | | | 1 Open the liftgate. | | | 2 Measure the resistance between the luggage compartment lamp C576 pin 2, circuit 31S-LB25 (BK/BU), harness side and ground. | | | Is the resistance less than 5 ohms? Yes INSTALL a new luggage compartment lamp. TEST the system for normal operation. No | | E3: CHECK CIRCUIT 31S-LB25 (BK/BU) FOR OPEN CIRCUIT | | | 1 Disconnect Liftgate Switch C565. | | | 2 Measure the resistance between the luggage compartment lamp C576 pin 2, circuit 31S-LB25 (BK/BU), harness side and the liftgate switch C565 pin 3, circuit 31S-LB25 (BK/BU), harness side. | | | Is the resistance less than 5 ohms? Yes INSTALL a new liftgate switch. TEST the system for normal operation. If the concern persists, GO to E4. No REPAIR the circuit. TEST the system for normal operation. | | E4: CHECK THE LIFTGATE SWITCH FOR GROUND | | | 1 Measure the resistance between the liftgate switch C565 pin 2, circuit 31-GL20 (BK), harness side and ground. | | | Is the resistance less than 5 ohms? Yes INSTALL a new liftgate switch. TEST the system for normal operation. If the concern persists, GO to E5. No REPAIR circuit 31-GL20 (BK). TEST the system for normal operation. | | E5: CHECK CIRCUIT 31S-GL20 (BK/RD) FOR OPEN CIRCUIT | | | 1 Measure the resistance between the liftgate switch C565 pin 1, circuit 31S-GL20 (BK/RD), harness side and the GEM C316 pin 20, circuit 31S-GL20 (BK/RD), harness side. | | | Is the resistance less than 5 ohms? Yes INSTALL a new GEM.
REFER to: Generic Electronic Module (GEM) (419-10 Multifunction Electronic Modules, Removal and Installation).
TEST the system for normal operation. No REPAIR the circuit. TEST the system for normal operation. | |
