Battery Saver
Note. Time-out is 1 minute if the vehicle has less than 80 km (50 miles).
The battery saver is internal to the SJB and provides automatic shut-off of the courtesy and demand lamp after 10 minutes in order to save battery voltage.
The SJB provides automatic shut-off of the courtesy and demand lamps after a time-out period in order to save battery voltage. A timer in the SJB is started when the ignition is turned OFF and all the doors are closed. When 10 minutes have elapsed, the voltage is automatically shut off to the lamps by the SJB. While the SJB has voltage disabled, the timer resets if any of the following occur
- The ignition state is changed to any position other than OFF.
- Any door becomes ajar.
- The UNLOCK button of the Remote Keyless Entry (RKE) transmitter is pressed.
- The instrument panel dimmer switch is placed in the DOME LAMP position.
- The headlamp switch is placed in the PARKING LAMPS or HEADLAMPS ON position.
- The multifunction switch is placed in the FLASH-TO-PASS position.
- The key is inserted into the ignition lock cylinder.
Courtesy Lamps
The courtesy lamp subsystem consists of door ajar switches, the instrument panel dimmer switch and the interior dome lamp. The SJB controls the courtesy lamp by providing power to the courtesy lamp. The courtesy lighting feature requests the courtesy lamp to be illuminated when any of the vehicle doors are ajar, the UNLOCK button on the RKE transmitter is pressed or by rotating the instrument panel dimmer switch to the highest point.
Illuminated Entry
The illuminated entry requests the courtesy lamp to illuminate when the ignition is OFF and either the RKE transmitter UNLOCK button is pressed, or the vehicle is unlocked using the driver door lock cylinder. The illuminated entry requests the courtesy lamp off
- after 25 seconds have elapsed.
- when the ignition is switched out of the OFF position.
- when the RKE transmitter LOCK button is pressed.
Illuminated Exit
The illuminated exit requests the courtesy lamp to illuminate for 25 seconds when all doors are closed and the ignition key is removed from the ignition lock cylinder. The illuminated exit deactivates
- when the ignition key is inserted into the ignition lock cylinder.
- when a door becomes ajar.
- after 25 seconds have elapsed.
Interior Lighting Delay
The interior lighting delay feature provides temporary illumination of the courtesy lamp after the doors are opened and then closed. The interior lighting delay feature keeps the courtesy lamp on for a period of 25 seconds after all the doors are closed. If during the 25-second delay time the SJB detects that the ignition has been switched out of the OFF position, or if the vehicle is locked using the RKE transmitter, the courtesy lamp illumination is discontinued.
Theater Lighting
The theater lighting feature ramps-up the courtesy lamp over 0.7 second when courtesy lamp activation is requested. The theater lighting feature ramps-down the courtesy lamp over 1.7 seconds when interior lighting deactivation is requested by any feature other than the panic alarm or battery saver.
Demand Lamps
The demand lamp is provided voltage from the battery saver relay (part of the SJB). The SJB energizes the battery saver relay to supply voltage to the demand lamp. The lamps that are part of the demand lamp subsystem are
- Map/reading lamps
- Vanity mirror lamps (if equipped)
- Luggage compartment lamp
- Glove compartment lamp
Ambient Lighting
The ambient lighting system consists of the BCM-B, and the harness with hardwired LEDs located within the front and rear footwells, door map pockets, door scuff plates, console storage bin and the floor console cup holders. The cup holder lid is equipped with an ajar switch that switches on or off the cup holder ambient lighting LEDs depending on the lid position.
The ambient lighting is split up into 3 separate zones. Zone 1 consists of the door map pockets. Zone 2 consists of the front and rear footwells, storage bin and the cup holders. Zone 3 consists of the door scuff plates.
The ambient lighting is powered on when any door is opened. When any door is closed, the power is turned off and is not supplied again until the parking lamps are turned on, or the key is put in the run position.
The message center switch is used to cycle the LEDs through 132 different color combinations (7 preset colors or 125 colors created through the MyColor™ feature) or to turn the ambient lighting off. The BCM-B provides the necessary voltage to all the LEDs to illuminate the 3 different zones.
SPECIAL TOOLS Fluke 77-IV Digital Multimeter FLU77-4 or equivalent Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool Flex Probe Kit NUD105-R025D or equivalent
Scheme 30
Scheme 31
Scheme 32
Interior Lamp Arbitrator
The SJB chooses between the interior lighting, dome defeat, interior lighting delay, illuminated entry, illuminated exit and battery saver to determine which feature has precedence of activating and deactivating the interior lamps.
The Body Control Module B (BCM-B) monitors the door courtesy lighting, courtesy lighting delay and illuminated exit requests. When a door is opened, the BCM-B turns on all 3 zones of the ambient lighting system. Zone 3 (door scuff plate LEDs) are turned off when any door is closed, or the illuminated entry request is detected by the BCM-B. The other 2 zones are turned off at the same time as the courtesy lighting by the BCM-B if the key is not activated in the ignition switch. The ambient lighting is reactivated when the ignition is placed in the accessory ON or RUN position.
The color of the LEDs always defaults to the last setting in the memory. There are 125 different color combinations that are achieved by adjusting the 3 primary (red, green and blue) colors.
Field-Effect Transistor (FET) Protection
Field-Effect Transistor (FET) is a type of transistor that when used with module software can be used to monitor and control current flow on module outputs. The FET protection strategy is used to prevent module damage in the event of excessive current flow.
The SJB utilizes an FET protective circuit strategy for many of its outputs (for example, a headlamp output circuit). Output loads (current level) are monitored for excessive current (typically short circuits) and are shut down (turns off the voltage or ground provided by the module) when a fault event is detected. A continuous DTC is stored at the fault event and a cumulative counter is started.
When the demand for the output is no longer present, the module resets the FET circuit protection to allow the circuit to function. The next time the driver requests a circuit to activate that has been shut down by a previous short (FET protection) and the circuit remains shorted, the FET protection shuts off the circuit again and the cumulative counter advances.
When the excessive circuit load occurs often enough, the module shuts down the output until a repair procedure is carried out. Each FET protected circuit has 3 predefined levels of short circuit tolerance based on the harmful effect of each circuit fault on the FET and the ability of the FET to withstand it. A module lifetime level of fault events is established based upon the durability of the FET. If the total tolerance level is determined to be 600 fault events, the 3 predefined levels would be 200, 400 and 600 fault events.
When each tolerance level is reached, the continuous DTC that was stored on the first failure cannot be cleared by a command to clear the continuous DTCs. The module does not allow this code to be cleared or the circuit restored to normal operation until a successful self-test proves that the fault has been repaired. After the self-test has successfully completed (no on-demand DTCs present), DTC B106E and the associated continuous DTC (the DTC related to the shorted circuit) automatically clears and the circuit function returns.
When the first or second level is reached, the continuous DTC (associated with the short circuit) sets along with DTC B106E. These DTCs can be cleared using the module on-demand self-test, then the Clear DTC operation on the scan tool (if the on-demand test shows the fault corrected). The module never resets the fault event counter to zero and continues to advance the fault event counter as short circuit fault events occur.
If the number of short circuit fault events reach the third level, then DTCs B106F and B1342 set along with the associated continuous DTC. This DTC cannot be cleared and the module must be replaced.
The BCM-B utilizes a similar strategy.
The SJB FET protected output circuits for the interior lighting system is the courtesy lamp output circuit.
The BCM-B FET protected output circuits for the interior lighting system are the ambient lighting output circuits.