• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
B+, BCM X4 Terminal 2 | B2615 00 | B2615 00 | -- | -- |
B+, BCM X3 Terminal 2 | B1480 00 | B1480 00 | -- | -- |
B+, BCM X2 Terminal 2 | B2652 00 | B2652 00 | -- | -- |
12 Volt Reference | B1395 00, B3600 03 | B3600 03 | -- | -- |
Courtesy Lamp Supply Voltage | B2615 00 | 1 | 2 | -- |
Inadvertent Power Courtesy Lamp | B1480 00 | 6 | -- | -- |
Courtesy Lamp On Switch Signal | 2 | 1 | 1* | -- |
Instrument Panel Lamps Dimmer Switch Signal | B3600 03 | B3600 03 | 9 | -- |
Interior Lamp Defeat Switch Signal | 1 | 10 | 10 | -- |
LED Backlight Dimming Control | B2610 00 | 7 | 8 | -- |
Instrument Panel Lamp Dimming Control | B2652 00 | 7 | 8 | -- |
Driver Door Open Switch Signal | 2 | 4 | 4 | -- |
Passenger Door Open Switch Signal | 2 | 5 | 5 | -- |
Ground - Courtesy Lamp | -- | 1 | -- | -- |
Ground - Driver Door Lock | -- | 4 | -- | -- |
Ground - Inadvertent Courtesy Lamps | -- | 6 | -- | -- |
Ground - Passenger Door Lock | -- | 5 | -- | -- |
* Internal damage to the switch may occur if shorted to B+ 1. Courtesy lamps are inoperative 2. Courtesy lamps are always On 3. Dome Lamp Switch Malfunction 4. Courtesy lamp control malfunction - driver door 5. Courtesy lamp control malfunction - passenger door 6. Inadvertent power courtesy lamps inoperative 7. Interior backlighting inoperative 8. Interior backlighting always On 9. Interior backlighting will not dim 10. Courtesy lamp defeat switch malfunction |
The BCM 3 fuse, located in the underhood fuse block, supplies battery voltage to the body control module (BCM). The BCM applies this voltage to the courtesy lamps through the courtesy lamp supply voltage circuit. When any door is opened, the door open switch contacts close and the BCM receives a door-open input. If the BCM receives a door lock or unlock input, the BCM will activate the courtesy lamp supply voltage circuit, providing battery voltage to the dome lamp and instrument panel (I/P) courtesy lamps. The courtesy lamps can be manually activated by placing the interior lamp switch in the DOME position.
Inadvertent power courtesy lamp feature provides a similar function for the interior lamps as a retained accessory power feature. The BCM will energize the courtesy lamps supply voltage circuit when the BCM is in the active state (awake). When the inadvertent power courtesy lamps supply voltage circuit is energized, it supplies voltage from the BCM 2 fuse located in the underhood fuse block, to all the interior lights listed below. The BCM will continue to supply voltage to the interior lamps after the ignition is turned OFF so that the interior lamps may be operated.
• | Front Dome/Reading Lamp |
• | Middle Dome/Reading Lamp |
• | Rear Dome/Reading Lamp |
• | Sunshade Mirror Lamps |
• | Underhood Lamp |
In the event that any of these lamps were to remain illuminated for a period of more than 20 minutes with the ignition switch in the OFF position and no BCM input activity, the BCM will deactivate the inadvertent power supply voltage circuit to prevent a total battery discharge condition.
Interior Lighting Systems Description and Operation
Control Module References for scan tool information
⇒ | If the Driver Door Open Sw. parameter does not change between Open and Closed, refer to Door Open Switch Circuit Test - Driver. |
⇒ | If the Passenger Door Open Sw. parameter does not change between Open and Closed, refer to Door Open Switch Circuit Test - Passenger. |
⇒ | If the Ctsy. Lamp Actv. Reason. parameter does not change between Door Open and Off, refer to Door Open Switch Circuit Test - Cargo. |
⇒ | If the Ctsy. Lamp Actv. Reason parameter does not change between Off and Manual, refer to Dome Lamp Switch Circuit Test. |
⇒ | If the Ctsy. Lamp Actv. Reason parameter does not change between Off and Manual Defeat, refer to Dome Lamp Switch Circuit Test. |
• | Dome Lamp Circuit Test |
• | Inadvertent Power Courtesy Lamps Circuit Test |
⇒ | If the test lamp does not illuminate, test the ground circuit for an open/high resistance. |
⇒ | If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the BCM. |
⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp does not illuminate, test the ground circuit for an open/high resistance. |
⇒ | If not the specified value, test the signal circuit terminal D for a short to ground. If the circuit tests normal, replace the BCM. |
⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp does not illuminate, test the ground circuit for an open/high resistance. |
⇒ | If not the specified value, test the signal circuit terminal D for a short to ground. If the circuit tests normal, replace the BCM. |
⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp does not illuminate, test the ground circuit for an open/high resistance. |
⇒ | If not the specified value, test the signal circuits listed below for a short to ground. If the circuits test normal, replace the BCM. |
• | Terminal 9 |
• | Terminal 12 |
⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp does not illuminate, test the ground circuit for an open/high resistance. |
⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp does not illuminate, test the ground circuit for an open/high resistance. |
• | Courtesy/Reading Lamp terminal C |
• | Left or Right Sunshade Mirror terminal A |
• | Underhood Lamp terminal A |
⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. |
• | Driver door signal terminal A and ground terminal D |
• | Front passenger door signal terminal D and ground terminal A |
• | Cargo door signal terminal D and ground terminal A |
⇒ | If not the specified value, replace the door lock. |
• | Driver door signal terminal A and ground terminal D |
• | Front passenger door signal terminal D and ground terminal A |
• | Cargo door signal terminal D and ground terminal A |
⇒ | If greater than the specified range, replace the door lock. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, setup, and programming |