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I am looking for a repair manual and can't find one I am having problems with my break lights. all my fuses and censors are good and I need help with the break light switch.

Here’s a wiring diagram showing the brake light circuit.

Notice how the wiring goes through 6 junctions. Junctions are used to connect one portion of a wiring harness to another and or a place of ease to add extra components too the circuit. 4 are on the power side of the bulbs and 2 on the ground side.
The connections in each one of these junctions could be a place for corrosion and bad connections to form.

I would begin testing with the brake light switch; making sure there was constant power on the green wire, coming from the fuse; then the blue/yellow wire as the brake peddle is depressed. Working my way back to and then through the bulbs too ground, on the black wire.

I’ve marked the different parts of the diagram, with red dots; which deal with the brake light circuit.

Dan.

Just purchased a 1993 Suzuki Samurai and need to smog it. Before we take it in to have it smog, we have a couple of questions:

1. In addition to a tune-up and oil change, is there anything else we can do to try to get this vehicle to smog the first time?

2. I have heard many times in the past, that one way to help an older vehicle pass smog is to fill the gas tank one or two times with unleaded supreme and drive it on the freeway until the entire tank of gas is used up. Is this a useful idea?

3. I am trying to find the Chilton guide at the library. In the Import Car Manual 1990-1994, the Suzuki Samurai does not have a section. In fact, no Suzuki cars have a section. What Chilton guide would I use?

4. Is doing an oil change on this Suzuki like doing an oil change on most other vehicles. Just drain, replace the plug, fill the engine with oil and replace the filter? What weight oil would be best? How many quarts should we use?

5. Other than replacing the spark plugs and maybe the plug wires, what else should we do for the tune-up?

6. Does it matter what brand and/or type of spark plug we install? Should we get "self-gaping" plugs. If not, what should the gap be set to?

I know these questions are really very basic, but haven't done a lot of tune-ups and want to be more confident. Thank you in advance for you help.

According to my database, you should be using 5W30 oil. 3.7 quarts, but it doesn't state with or without filter change. Change the oil and filter, add 3.5 qts., start and run the engine, check for leaks, shut it off and recheck the oil level. Add as needed. Replacing the plugs, wires, cap, and rotor sure won't hurt. Chilton's is my least favorite for repair manuals, next to Haynes. Mitchell and Motors are much better. Your public library should be a good source of info.
Spark plug gap: .029"; NGK Spark plug # BPR5ES.

Hi everyone,

I've been struggling with a problem on my roommate's newly purchased 2006 Suzuki Swift for a few days now. I have electrical engineering experience but am having trouble understanding what is going on with this car as the repair manual schematics don't seem to match the car and I have no reference car to see how the system should normally work. The problem is the horn button is not triggering the horn but the horn itself, which is near the rad on the front of the car, works if I put a voltage across it. The car was recently purchased and we need to fix the horn to pass safety. I'm not sure if I'm having a combination of two problems or just one.

First of all there is a HORN/REAR FOG fuse in the dash fuse/junction box as well as a HORN fuse in the engine junction box. There is power (+12v) going from the horn fuse in the dash to a connector in the steering enclosure (in the same enclosure as the ignition, turn signals and headlight controls) via an orange wire. On the same connector there are two green wires tied together. The other side of the connector has 1 red and 1 black. Through the connector, the orange goes to red and the two green go to black. The red and black wires seem like they go through the steering column to the two horn buttons on the steering wheel. However, the red side of the button has no voltage and no connectivity to the red on the connector in the steering enclosure. The black is connected to ground. Thinking the horn button was a straight through switch that simply connects red to black when pushed (and testing this theory by with the ohm meter and getting 0 ohms when pushed), I shorted red to black on the connector in the steering enclosure and it blew the HORN/REAR FOG fuse in the dash junction box. This makes me wonder if there was already a short somewhere and someone messed around and burnt the red wire that goes through the steering column/wheel.

Furthermore, when testing the wires on the physical horn near the rad (1 black and 1 red), there is a constant +12v on the red wire, whether the button is pushed or not, and the black wire doesn't seem to have a connection to ground. My first question is, is this normal? Would the horn relay be on the black side of the horn? That is the only way I can make sense of these readings.

My second question is where is the horn relay on this car? It is not listed on the engine junction box and the dash junction box lists none of the relays and as I said, the service manual I got from Suzuki's web site is not making sense. None of the connectors, wire colours, or even fuse locations seem to line up with what I am seeing in the car. For example, the manual says the horn and hazards are on the same fuse whereas the sticker on the fuse box in the car lists HORN/REAR FOG.

If someone could give me a diagram or even verbally describe the circuit it would also be much appreciated.
I would think it would go dash junction/fuse, to button, to horn relay (trigger side), to ground. Then separate circuit from engine junction, to horn relay, to horn to ground.
But I don't know if stuff is all shorted and broken or if the horn circuit actually goes engine junction, to horn, to horn relay, to ground.

I'll put some pictures up as reference to what I'm talking about.

I don't see them making a Swift for US in 2006. I see you're in Canada but that shouldn't change anything.

Interesting.. let me double check with the the owner

It is probably going to look like this set up. More than likely the short occurs when the relay energizes when the relay coil is grounded by the horn switches. Since the fuse protects the circuit for both the load and coil parts of the relay. The short is on the load side of the circuit between the relay and the horn itself. Take a 12 volt test light and connect it to battery positive. Remove the power wire from the horn. Then touch the probe on the power wire. If the test light illuminates, that circuit is shorted somewhere.

It is probably going to look like this set up. More than likely the short occurs when the relay energizes when the relay coil is grounded by the horn switches. Since the fuse protects the circuit for both the load and coil parts of the relay. The short is on the load side of the circuit between the relay and the horn itself. Take a 12 volt test light and connect it to battery positive. Remove the power wire from the horn. Then touch the probe on the power wire. If the test light illuminates, that circuit is shorted somewhere.



Ok, this is the circuit diagram I had in my head. When I test the power wire on the horn against battery ground I am getting +12v, which I felt was wrong or indicated a short. I did suspect the relay being the culprit but because all of the wires are bundled and the colours change, and the horn button isn't doing anything, I'm having troubled locating the horn relay. In my original post (and attached pics) I noted there are two horn fuses. One in the dash and one in the engine.

Do you have a good way to locate the horn relay? I pulled all the relays in the dash and they seem to be functioning properly, although there is a weird one in there that I'm not sure how to test (the purple one in the picture).

Relays usually don't short internally. Unplugging the relay and performing your short test would tell you if the problem is the relay or the wiring. I suspect wiring myself. Not sure where the relay is located, but you could watch the voltage on the wire that comes from the relay coil at the connector at your steering wheel and see if it goes away as you remove relays. With a good fuse, of course.

Curious, but what is the voltage sitting at the horn switch connector?

Do you think this could be a "96?

Do you think this could be a "96?

No, it's nowhere near that old. Maybe 2008? I'll get her to send me a pic of the car itself from the outside if that helps.