I read a post where the Autolamps stayed on during the day after someone installed HID headlights.
I know my dash mounted light sensor is working because my dash lights brighten and dim as I go between light and dark ambient light.
The post reminded me that the Autolamps turn on when the wipers are turned on.
What I expect to find on my car is the white wire is pulled to ground even when the wipers are off. I will try looking deeper into this on my car later.
The Smart Junction Box (SJB) sends a 12 volt reference signal on circuit CRW01 (WH) to the wiper motor module in order to monitor the status of the wipers. When the headlamp control switch is in the AUTOLAMP position and the wipers are on, the wiper motor module will pull the voltage reference signal low. After 3 seconds, the SJB will activate the headlamps.
In other words: The SJB sends a current limited, 12V signal to the wiper control box. When the wipers go on the wiper control box pulls the white wire to ground.
1) You can either replace the wiper control box (
about $100) to restore original functionality but you lose being able to use HIDs.
2)The cheap route would be to clip the white wire, allowing the signal out of the SJB to float back up to 12V and your autolamp function should return - and you can keep your HIDs. However you lose the headlights turning on automatically during the day when the wipers go on.
3) You can replace the wiper control box and put a relay where your headlights would be powered, run +12V BATT through the relay and then power your HIDs with battery power.
Note: After thinking deeper into this if someone is having an issue with the autolamps staying on when they should not unplugging C2157 (connector to the wiper control module) temporarily should allow the autolamps to function normally - assuming the light sensor is working properly.
Hope this helps someone - this has been driving me nuts for years.
Attached are the pictures you can use to verify this scenario.
Edited by wrbrower, 12 May 2017 - 07:41 PM.