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Different testing method Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Mon, 13 Dec 2004 10:07:29
In Reply to: How do I test it +Where do I get the high beam switch?, adl6009 [Profile/Gallery]
, Sun, 12 Dec 2004 14:33:40
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I don't have a set of 9-5 headlight schematics, but the wiring is somewhat similar to the 9000. The way the headlights work is that there is one wire for high beam, and one wire for low beam, from the headlight relay to the lamp control module (LCM). Inside the LCM, the high beam wire splits into two, goes through some circuitry, and comes out on two pins. The same for the low beam (two different pins). These four wires then run through four different fuses, and out to the four filaments.
The 'wiring' in the LCM consists pretty much of straight through wires. There is no switching or contacts of the headlight current. About all that really goes wrong with the LCM is to not detect a bad filament, or more likely, announce a bad filament if one is actually OK. You can test to see if the current goes through the LCM - pull the LCM out, and with an ohmmeter measure between pins 4, 6 and 8 - they should all be connected together (high beam). Low beams are on pins 1, 2, and 3.
Assuming that's OK, you know the LCM is OK. And since everything 'downstream' of that point is two different circuits, it's unlikely that there is one fault taking out both high beams.
With the LCM out, switch your meter to Volts, and measure between pin 4 of the LCM SOCKET and ground. If you hit the high beam switch, it should toggle between 12 volts (or so) and no volts. It may not go to zero volts, because in the low beam mode, the wire is just floating. The dash High Beam indicator won't work, because it's downstream of the LCM.
If this voltage doesn't toggle on and off as you hit the high beam indicator, you can start working your way back into the system.
I don't know the turn signal wiring, but with the schematic, it would be easily done - simply measure the continuity of the high beam switch contacts with the switch activated.
posted by 192.249....
, Sun, 12 Dec 2004 14:33:40, Mon, 13 Dec 2004 10:07:29 <-- Viewing This Message, Mon, 13 Dec 2004 10:48:36, Mon, 13 Dec 2004 16:46:31, Tue, 14 Dec 2004 18:57:26
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