headlight hi beam question
Thread Starter
Joined: Jul 2006
Posts: 432
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From: Central Coast of California
headlight hi beam question
Hey guys I have a 1989 s 5 and everytime I throw my high beams on they pop out a high beams into low beams I have to keep on holding the switch for the high beams to be on has anybody else experienced this before I gotta make note that I have replace the headlight switch and the turn signal switch is anybody that can send me on a good direction thank you guys
west west yall!
west west yall!
MECP Certified Installer
Joined: Feb 2009
Posts: 3,176
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From: Mesquite, TX-DFW
Could be the latching circuit in the CPU. If the relay at the nose of the car is doing its job, then that is most likely your issue (probably is since that relay has to work for them to even come on).
To fix, you can do one of three things.
A)Replace cpu, the obvious.
B)Wire in a new latching circuit using relays. Schematic...
Special Applications with SPDT Relays, Diagrams
C) wire in a switch to trigger ground on the high beam relay up front.
To fix, you can do one of three things.
A)Replace cpu, the obvious.
B)Wire in a new latching circuit using relays. Schematic...
Special Applications with SPDT Relays, Diagrams
C) wire in a switch to trigger ground on the high beam relay up front.
Thread Starter
Joined: Jul 2006
Posts: 432
Likes: 2
From: Central Coast of California
Thread Starter
Joined: Jul 2006
Posts: 432
Likes: 2
From: Central Coast of California
Could be the latching circuit in the CPU. If the relay at the nose of the car is doing its job, then that is most likely your issue (probably is since that relay has to work for them to even come on).
To fix, you can do one of three things.
A)Replace cpu, the obvious.
B)Wire in a new latching circuit using relays. Schematic...
Special Applications with SPDT Relays, Diagrams
C) wire in a switch to trigger ground on the high beam relay up front.
To fix, you can do one of three things.
A)Replace cpu, the obvious.
B)Wire in a new latching circuit using relays. Schematic...
Special Applications with SPDT Relays, Diagrams
C) wire in a switch to trigger ground on the high beam relay up front.
west west yall!
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The relay was being questioned and not the headlights. Locate the headlight relay at the front of the engine bay. Has five wires w/one wire being White. W/the low beams on, ground the White wire in this relay and see if the high beams illuminate or not.
Thread Starter
Joined: Jul 2006
Posts: 432
Likes: 2
From: Central Coast of California
west west yall!
Thread Starter
Joined: Jul 2006
Posts: 432
Likes: 2
From: Central Coast of California
I checked the dimmer relay (the one with 5 pins in front of the car) i did a resistance test and it was within spec. I been on the hunt to fix this issued i ended calling mazdatrix and they told me that the headlight switch is something i would have at. Is there anyone on here that had this issue with there headlight switch? i know I'm close to finding out the problem.
Thread Starter
Joined: Jul 2006
Posts: 432
Likes: 2
From: Central Coast of California
I have the plastic cover off the one that goes around the gauge cluster off and I have the headlight switch connected with its side plastic off I have the printed circuit board exposed I just need to know what point to probe
In post #8 it says 'headlight relay,' but I was mistaken and typed the wrong name but meant the dimmer relay (headlight relay has only 4 wires while the dimmer has 5). So, with the low beams on, the White wire of the dimmer relay needs to be grounded and the high beams should come on and stay on.
Last edited by satch; May 10, 2014 at 09:05 PM.
Would you please stop w/the testing within spec crap. Just ground the damn White wire as advised and you'll be able to diagnose what the problem is. The headlight switch has nothing to do w/your problem. I don't understand why you can't do a simple test which takes all of 10 seconds. If you refuse to do a simple test to indicate what your problem is then you can rely on someone else to assist you.
Thread Starter
Joined: Jul 2006
Posts: 432
Likes: 2
From: Central Coast of California
Would you please stop w/the testing within spec crap. Just ground the damn White wire as advised and you'll be able to diagnose what the problem is. The headlight switch has nothing to do w/your problem. I don't understand why you can't do a simple test which takes all of 10 seconds. If you refuse to do a simple test to indicate what your problem is then you can rely on someone else to assist you.
Okay let me ground out the white cable on the relay
Thread Starter
Joined: Jul 2006
Posts: 432
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From: Central Coast of California
Gee, who would have thought. When you pull back on the dimmer lever the dimmer unit places a ground on the Red/Yellow wire in that switch. The R/Y wire connects to a White wire at connector X-17. This is the White wire found at the dimmer relay. So, either the connection is poor at X-17 or the dimmer switching mechanism is broken or the connection at the dimmer switch is poor. You can place a ground to the R/Y wire at the dimmer switch plug just like you did to the White wire and if the lights switch from low beam to high beam then the problem is the dimmer switch and not connector X-17 or the connection to the dimmer plug.
Thread Starter
Joined: Jul 2006
Posts: 432
Likes: 2
From: Central Coast of California
Gee, who would have thought. When you pull back on the dimmer lever the dimmer unit places a ground on the Red/Yellow wire in that switch. The R/Y wire connects to a White wire at connector X-17. This is the White wire found at the dimmer relay. So, either the connection is poor at X-17 or the dimmer switching mechanism is broken or the connection at the dimmer switch is poor. You can place a ground to the R/Y wire at the dimmer switch plug just like you did to the White wire and if the lights switch from low beam to high beam then the problem is the dimmer switch and not connector X-17 or the connection to the dimmer plug.
Thread Starter
Joined: Jul 2006
Posts: 432
Likes: 2
From: Central Coast of California
I just got home and did the test it did the same thing like the white wire it went from low to high beam lights and stayed there as long as I was applying the ground With my back probe.