Daytime Running Lamp: Description and Operation
HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -The headlamp system for Canada vehicles contains a daytime light control unit that activates the high beam headlamps at approximately half illumination whenever the engine is running. If the parking brake is applied before the engine is started the daytime lights will not be illuminated. The daytime lights will illuminate once the parking brake is released. Thereafter, the daytime lights will continue to operate when the parking brake is applied. And battery saver system is controlled by the smart entrance control unit.
Power is supplied at all times
- to headlamp LH relay terminals 1 and 5
- through 15 A fuse (No.68, located in the fuse and fusible link box), and
- to headlamp RH relay terminals 1 and 5
- through 15 A fuse (No.69, located in the fuse and fusible link box), and
- to smart entrance control unit terminal 49
- through 10 A fuse [No.13, located in the fuse block (J/B)].
Ground is supplied
- to daytime light control unit terminal 16 and
- to smart entrance control unit terminals 43 and 64
When the ignition switch is in the ON or START position, power is also supplied
- to daytime light control unit terminal 3
- through 10 A fuse [No.28, located in the fuse block (J/B)], and
- to smart entrance control unit terminal 27
- through 10 A fuse [No.10, located in the fuse block (J/B)].
When the ignition switch is in the ACC or ON position, power is supplied
- to smart entrance control unit terminal 26
- through 10 A fuse [No.1, located in the fuse block (J/B)].
When the ignition switch is in the START position, power is supplied
- to daytime light control unit terminal 2
- through 10 A fuse [No. 21, located in the fuse block (J/B)].
HEADLAMP OPERATION
Power Supply to Low Beam and High Beam
When lighting switch is in 2ND or PASS position, ground is supplied
- to headlamp LH relay terminal 2 from smart entrance control unit terminal 21
- through smart entrance control unit terminal 22
- from lighting switch terminal 12, and
- to headlamp RH relay terminal 2 from smart entrance control unit terminal 59
- through smart entrance control unit terminal 60
- from lighting switch terminal 12.
Headlamp relays (LH and RH) are energized and then power is supplied to headlamps (LH and RH).
Low Beam Operation
When the lighting switch is turned to 2ND and LOW ("B") positions, ground is supplied
- to terminal 2 of the headlamp LH
- through daytime light control unit terminals 11 and 15
- through lighting switch terminals 10 and 8
- through body grounds E11, E22 and E53.
Ground is also supplied
- to terminal 2 of the headlamp RH
- through daytime light control unit terminals 8 and 12
- through lighting switch terminals 7 and 5
- through body grounds E11, E22 and E53.
With power and ground supplied, the low beam headlamps illuminate.
High Beam Operation/Flash-to-pass Operation
When the lighting switch is turned to 2ND and HIGH ("A") or PASS ("C") positions, ground is supplied
- to terminal 1 of LH headlamp
- through daytime light control-unit terminals 10 and 14, and
- to combination meter terminal 27 for the HIGH BEAM indicator
- through lighting switch terminals 9 and 8
- through body grounds E11, E22 and E53.
Ground is also supplied
- to terminal 1 of RH headlamp
- through daytime light control unit terminals 9 and 13
- through lighting switch terminals 6 and 5
- through body grounds E11, E22 and E53.
With power and ground supplied, the high beam headlamps and HIGH BEAM indicator illuminate.
BATTERY SAVER CONTROL
Headlamps will remain on for a short while after the ignition switch is turned ON (or START) from OFF (or ACC).
Continuity between terminals 21 and 22, and between terminals 59 and 60 of smart entrance control unit will be disturbed after 45 seconds, then the headlamps will be turned off.
Then headlamps are turned off.
The headlamps are turned off when LH or RH door is opened even if 45 seconds have not passed after the ignition switch is turned from ON (or START) to OFF (or ACC) positions while headlamps are illuminated.
When the lighting switch is turned from OFF to 2ND after headlamps are turned to off by the battery saver control, ground is supply
- to smart entrance control unit terminals 20 and 58 from lighting switch terminal 11, and then
- to headlamp LH and RH relays terminal 2 from headlamp battery saver control unit terminals 21 and 59
- through smart entrance control unit terminals 22 and 60, and
- through lighting switch terminal 12.
Then headlamps illuminate again.
AUTO LIGHT OPERATION
For auto light operation, refer to "HEADLAMP".
DAYTIME LIGHT OPERATION
With the engine running, the lighting switch in the OFF or 1ST position and parking brake released, power is supplied
- through daytime light control unit terminal 7
- to terminal 3 of RH headlamp
- through terminal 1 of RH headlamp
- to daytime light control unit terminal 9
- through daytime light control unit terminal 6
- to terminal 3 of LH headlamp.
Ground is supplied to terminal 1 of LH headlamp.
- through daytime light control unit terminals 10 and 16
- through body grounds E11, E22 and E53.
Because the high beam headlamps are now wired in series, they operate at half illumination.
OPERATION
After starting the engine with the lighting switch in the "OFF" or "1ST" position, the headlamp high beam automatically turns on. Lighting switch operations other than the above are the same as conventional light systems.