DESCRIPTION & OPERATION
| WARNING | Vehicles are equipped with air bag supplemental restraint system. Before attempting any repairs involving steering column, instrument panel or related components, see SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM in AIR BAG RESTRAINT SYSTEMS article. |
| CAUTION | When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery. |
| WARNING | Halogen bulbs have pressurized gas inside and require special handling. They can burst if scratched or dropped. Hold a bulb only by the plastic or metal case. Don't touch the glass part of a bulb with bare hands. When high voltage socket of discharge headlight is touched with the light control switch in HEAD position, high voltage of 20,000 volts is momentarily generated. This might lead to a serious accident. Never connect the tester to the high voltage socket of discharge headlight for measurement, as this leads to a serious accident because of high voltage. When performing operation related to the discharge headlight, make sure to do it in the place with no water or rain to prevent electric shock, with the light control switch OFF, battery terminal removed and connector of the light control ECU disconnected. When performing operation related to the discharge headlight, make sure to do it after assembling has been completely over and never light up without a bulb installed. Do not light up the discharge headlight using another power source except vehicle's. When there is a defect on the discharge headlight or any shock has been applied to it, replace the light with a new one. Even if the light operates normally, there is a possibility that the fail-safe function works. |
Note. There is a 12-pin driver side junction block-to-body ECU connector that is ONLY accessible after separation from the junction block.
Operation
The automatic light control sensor converts the intensity of the illumination into frequency and inputs it to the body ECU No. 2. When the light control switch is set at AUTO, the signal is input to connector B6 terminal No. 3 (AUTO) of the body ECU No. 2. See WIRING DIAGRAMS . Through communication control of the body ECU No. 2 and door ECU etc., the taillights and headlights are automatically turned on or off.
Turn ON Operation - When the body ECU No. 2 receives the frequency signal from the automatic light control sensor and determines that the brightness around the vehicle has decreased below a specified level, terminal No. 6 (TRLY) and connector B6 terminal No. 9 (HRLY) of the body ECU No. 2 are controlled through communication control of the body ECU No. 2 and door ECU etc. As a result, the taillights and headlights light up as the TAIL relay and HEAD LP relay are turned on.
Turn OFF Operation - When the body ECU No. 2 receives the frequency signal from the automatic light control sensor and determines that the brightness around the vehicle has exceeded a specified level, terminal No. 6 (TRLY) and connector B6 terminal No. 9 (HRLY) of the body ECU No. 2 are controlled through communication control of the body ECU No. 2 and door ECU etc. As a result, the taillights and headlights go off as the TAIL relay and HEAD LP relay are turned off.
Additionally, when the ignition switch is changed from ON to OFF and any door is opened, and then closed with the taillights and headlights lit (the automatic light control is functioning), the taillight and headlights are turned off in the same manner as the light auto turn off operation.
Taillights ON - If the ignition switch is turned from ON to OFF with the taillights turned on (the light control switch is set at TAIL), the signal is input to terminal No. 1 (IG) of the body ECU No. 2. At this time, if the driver door is opened, the signal is input from the door courtesy switch front LH to connector D23 terminal No. 15 (CTY) of the driver door ECU. After that, terminal No. 6 (TRLY) of the body ECU No. 2 is controlled through communication control of the body ECU and door ECU etc. to turn off the TAIL relay. As a result, the current flowing into the taillights is cut off to turn off the taillights.
Taillights & Headlights ON - If the ignition switch is turned from ON to OFF with the taillights and headlights turned on (the light control switch is set at HEAD), the signal is input to terminal No. 1 (IG) of the body ECU No. 2. At this time, if any door is opened, the signal is input from the door courtesy switch to connector D23 terminal No. 15 (CTY) of the driver door ECU. During this operation, the taillights and headlights remain lit. When all doors and the luggage door are closed, the taillights and headlights are turned on for 30 seconds, through communication control of the body ECU and door ECU. After the set time has elapsed, a signal is input to terminal No. 6 (TRLY) and connector B6 terminal No. 9 (HRLY) of the body ECU No. 2, to turn off the TAIL relay and HEAD LP relay. As a result, the current flowing into the taillights and headlights is cut off to turn off the taillights and headlights.
If any door is opened during the above operation, the taillights and headlights light up for 30 seconds again and then go off after all the doors have been closed. Additionally, if the vehicle is locked using the wireless door lock operation while the taillights and headlights are being turned on for 30 seconds, the taillights and headlights go off immediately.