3rd brake light not working. CHMSL

[jad1014]

Originally Posted by Matt B

Only the triple connector is involved in brake light action. As already stated: the center one feeds energy, two outer ones route it to the brake lights when the switch is engaged.
The other connector to my knowledge disengages the cruise control but I'm not 100% sure.
You may try to bridge the connector with a bridge lead center-left and center-right which should engage your lights. If not there is a broken circuit. Also you can measure resistance between the connector and the bulb socket to check for a broken circuit. Refer to the FSM to find out which wire is yours.
Again: easiest point to start from is to measure at the third brake light sockets. You either lack positive or ground. Find out what's missing and follow the path down to either the body or switch.


Sent from my SM-G991B using ZR-1 Net Registry mobile app

Using a test light -The orange center wire is always energized. The blue wire is energized when the brake is pressed. The white is not energized when the brake is pressed.

I checked at the CHSML lights by probing the wires going into the bar that holds the four bulbs. No energy when the brake was depressed. Thanks again for your insight.

[Matt B]

If one wire is not energized, i.e. the respective (outer) connector of the switch remains cold with the pedal depressed, the switch is faulty. Refer to my picture in post #2. You said you replaced the switch, no? Did you install a brand new or used one?

[jad1014]

Originally Posted by Matt B

If one wire is not energized, i.e. the respective (outer) connector of the switch remains cold with the pedal depressed, the switch is faulty. Refer to my picture in post #2. You said you replaced the switch, no? Did you install a brand new or used one?

New switch from NAPA.

[Matt B]

Where exactly did you hook up you test light for ground and positive? And was the connector attached to the switch or not during test?

Sent from my SM-G991B using ZR-1 Net Registry mobile app

[jad1014]

Originally Posted by Matt B

Where exactly did you hook up you test light for ground and positive? And was the connector attached to the switch or not during test?

Sent from my SM-G991B using ZR-1 Net Registry mobile app

The positive was probing the connector itself while plugged into the switch. The ground was on bare metal that was beneath the trim panel that was removed to access the wiring. The car is going to a mechanic tomorrow. My fundamentals are weak in this area as one can tell.