Headlamp (For Canada) - Daytime Light System

System Description
Daytime light system turns on daytime light lamps while driving. Daytime light lamps are not turned on if engine is activated with parking brake on. Take off parking brake to turn on daytime light lamps. The lamps turn off when lighting switch is in the 2ND position or AUTO position (Headlamp is "ON") and when lighting switch is in the PASSING position. (Daytime light lamps are not turned off only by parking brake itself.) A parking brake signal and engine run or stop signal are sent to BCM (body control module) by CAN communication line.

OUTLINE
Power is supplied at all times
- through 10 A fuse [No. 19, located in the fuse block (J/B)]
- to combination meter terminal 3, and
- through 20 A fuse [No. 53, located in the IPDM E/R (intelligent power distribution module engine room)]
- to CPU (central processing unit) of IPDM E/R, and
- to headlamp high relay, located in the IPDM E/R, and
- to headlamp low relay, located in the IPDM E/R, and
- through 50 A fusible link (letter g, located in the fuse and fusible link box)
- to BCM terminal 70, and
- through 10 A fuse (No. 45, located in the IPDM E/R)
- to daytime light relay 1 terminals 2 and 5.

When the ignition switch is in ON or START position, power is supplied
- to ignition relay, located in the IPDM E/R, and
- through 10 A fuse [No. 14, located in the fuse block (J/B)]
- to combination meter terminal 16, and
- through 10 A fuse [No. 1, located in the fuse block (J/B)]
- to BCM terminal 38.

Ground is supplied
- to BCM terminal 67 and
- to combination meter terminals 13 and 23
- through grounds M57, M61 and M79.

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

Ground is supplied
- to front combination lamp RH (headlamp) terminal 2
- to daytime light relay 1 terminal 4
- to daytime light relay 2 terminal 1
- through grounds E9, E15 (all) and E24 (VQ40DE engine only).

When the CPU of the IPDM E/R energizes the headlamp low relay, it de-energizes daytime relay 1. When de-energized, this relay supplies ground
- to front combination lamp LH (headlamp) terminal 2
- through daytime light relay 1 terminal 3.

With power and ground supplied, low beam headlamps illuminate.

High Beam Operation/Flash-to-Pass Operation
With the lighting switch in 2ND position and placed in HIGH or PASS position, the BCM receives input requesting the headlamp high beams to illuminate. This input is communicated to the IPDM E/R across the CAN communication lines. The CPU of the combination meter controls the ON/OFF status of the HIGH BEAM indicator. The CPU of the IPDM E/R controls the headlamp high relay coil. When energized, this relay directs power
- through 10 A fuse (No. 34, located in the IPDM E/R)
- through IPDM E/R terminal 56
- to front combination lamp RH (headlamp) terminal 1, and
- through 10 A fuse (No. 35, located in the IPDM E/R)
- through IPDM E/R terminal 55
- to front combination lamp LH (headlamp) terminal 1.

Ground is supplied
- to front combination lamp RH (headlamp) terminal 2, and
- to daytime light relay 1 terminal 4, and
- to daytime light relay 2 terminal 1
- through grounds E9, E15 (all) and E24 (VQ40DE engine only).

When the CPU of the IPDM E/R energizes the headlamp high relay, it de-energizes daytime relay 1. When de-energized, this relay supplies ground
- to front combination lamp LH (headlamp) terminal 2
- through daytime light relay 1 terminal 3.

With power and ground supplied, the high beam headlamps illuminate.

DAYTIME LIGHT OPERATION
With the engine running, the lighting switch in the OFF or 1ST position and parking brake released, the IPDM E/R receives input requesting the daytime lights illuminate. This input is communicated across the CAN communication lines. The CPU of the IPDM E/R controls daytime light relay 1 coil. When energized, this relay directs power
- through daytime light relay 1 terminal 3
- through front combination lamp LH (headlamp) terminal 2
- through front combination lamp LH (headlamp) terminal 1
- through IPDM E/R terminal 55
- through 10 A fuse (No. 35, located in the IPDM E/R)
- through 10 A fuse (No. 34, located in the IPDM E/R)
- through IPDM E/R terminal 56
- to front combination lamp RH (headlamp) terminal 1.

Ground is supplied
- to front combination lamp RH (headlamp) terminal 2
- through grounds E9, E15 (all) and E24 (VQ40DE engine only).

With power and ground supplied, the daytime lights illuminate. The high beam headlamps are now wired in series and illuminate at a reduced intensity.

COMBINATION SWITCH READING FUNCTION
Refer to "COMBINATION SWITCH READING FUNCTION". Combination Switch Reading Function

AUTO LIGHT OPERATION
For auto light operation, refer to "System Description".

CAN Communication System Description
Refer to "INFORMATION BUS".