Headlamp (For CANADA) - Daytime Light System

HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM

Headlamp (For CANADA) - Daytime Light System Schematic:

Headlamp (for CANADA) - Daytime Light System Schematic

System Description
Headlamp operation is controlled by the BCM (body control module) based on inputs from the combination switch (lighting switch). When the lighting switch is placed in the 2ND position, the BCM receives an input signal requesting the headlamps (and tail lamps) illuminate. The request is then communicated to the IPDM E/R (intelligent power distribution module engine room) via the CAN communication lines. The CPU (central processing unit) located in the IPDM E/R controls ground for the headlamp high and headlamp low relay coils. These relays direct power to the respective headlamps, which then illuminate. When the headlamp switch is OFF or in the 1ST position (parking lamps ON), the parking brake is released and the engine is running, the IPDM E/R de-energizes the headlamp relays and supplies ground to the daytime light relay 1 to actuate the daytime light function.

OUTLINE
Power is supplied at all times
- to headlamp high relay RH and LH (located in IPDM E/R)
- to headlamp low relay (located in IPDM E/R) and
- to ignition relay (located in IPDM E/R)
- through 15 A fuse (No. 52, located in IPDM E/R) and
- through 20 A fuse (No. 53, located in IPDM E/R)
- to CPU located in IPDM E/R,
- through 40 A fusible link (letter g, located in fuse and fusible link box)
- to BCM terminal 70,
- through 10 A fuse [No. 8, located in fuse block (J/B)]
- to BCM terminal 57,
- through 10 A fuse [No. 13, located in fuse block (J/B)]
- to combination meter terminal 27,
- through 10 A fuse (No. 26, located in fuse and fusible link box)
- to the daytime light relay 1.

With the ignition switch in the ON or START position, power is supplied
- to the ignition relay (located in IPDM E/R),
- through 10 A fuse [No. 6, located in fuse block (J/B)]
- to BCM terminal 38,
- through 10 A fuse [No. 3, located in fuse block (J/B)]
- to combination meter terminal 28.

With the ignition switch in the ACC or ON position, power is supplied
- through 10 A fuse [No. 20, located in fuse block (J/B)]
- to BCM terminal 11. Ground is supplied
- to BCM terminal 67 and
- to combination meter terminals 21, 22 and 23
- through grounds M57 and M61,
- to IPDM E/R terminals 39 and 59
- through grounds E15 and E24,

HEADLAMP OPERATION

Low Beam Operation
With the lighting switch in 2ND position, the BCM receives an input signal requesting the headlamps to illuminate. This input signal is communicated to the IPDM E/R via the CAN communication lines. The CPU located in the IPDM E/R controls the headlamp low relay coil, which when energized, directs power
- through 15 A fuse (No. 41, located in IPDM E/R)
- through IPDM E/R terminal 54
- to daytime light relay 2 terminals 1 and 5 (energizing the relay),
- through daytime light relay 2 terminal 3
- to front combination lamp RH terminal 3, and
- through 15 A fuse (No. 40, located in IPDM E/R)
- through IPDM E/R terminal 52
- to front combination lamp LH terminal 3.

Ground is supplied
- to front combination lamp LH terminal 2
- through grounds E15 and E24,
- to headlamp RH terminal 2 via
- daytime light relay 1 terminals 3 and 4
- through grounds E15 and E24.
With power and ground supplied, low beam headlamps illuminate.

High Beam/Flash-to-Pass Operation
With the lighting switch in 2ND position and high beam switch in the HIGH position, the BCM receives input signal requesting the headlamp high beams to illuminate. The flash-to-pass feature can be used any time and also sends a signal to the BCM. This input signal is communicated to the IPDM E/R and the combination meter via the CAN communication lines. The CPU located in the IPDM E/R controls the headlamp high relay coil, which when energized, directs power
- through 10 A fuse (No. 34, located in IPDM E/R)
- through IPDM E/R terminal 56
- to front combination lamp RH terminal 1, and
- through 10 A fuse (No. 35, located in IPDM E/R)
- through IPDM E/R terminal 55
- to front combination lamp LH terminal 1.

Ground is supplied
- to front combination lamp LH terminal 2
- through grounds E15 and E24, and
- to front combination lamp RH terminal 2 via
- daytime light relay 1 terminals 3 and 4
- through grounds E15 and E24.
With power and ground supplied, the high beam headlamps illuminate.
The BCM sends a signal to the combination meter requesting the high beam indicator lamp to turn ON.

Daytime Light System Operation
With the lighting switch in the OFF or 1ST position (parking lamps ON), the BCM receives inputs requesting the headlights off. If the parking brake is released and the engine is running, the BCM then sends a signal, via the CAN communication lines, requesting the IPDM E/R to activate the daytime light system. The CPU located in the IPDM E/R controls the daytime light relay 1 coil, which when energized, directs power
- from daytime light relay 1 terminal 3
- to front combination lamp RH terminal 2,
- through front combination lamp RH high beam terminal 1
- to IPDM E/R terminal 56,
- through 10 A fuse (No. 34, located in IPDM E/R) and
- through both de-energized headlamp high relays
- to 10 A fuse (No. 35, located in IPDM E/R),
- through IPDM E/R terminal 55
- to front combination lamp LH terminal high beam 1.

Ground is supplied
- to front combination lamp LH terminal 2
- through grounds E15 and E24,
- to daytime light relay 1 terminal 1
- through IPDM E/R terminal 6.
With power and ground supplied, high beam headlamps illuminate at reduced intensity.

COMBINATION SWITCH READING FUNCTION
Refer to "System Description" in Body Control System.

EXTERIOR LAMP BATTERY SAVER CONTROL
Refer to "System Description".