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I know that I have ck wiring. I would like to replace my high mount brake light fixture. Not sure all 2004 are ck. the info on all replacement do not mention ck. do I assume if the chart says it will?
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User 1998 mazda b4000 high mount light doesn't work. where is fuse located? not shown on manual.
ChatGPT The high mount brake light fuse on a 1998 Mazda B4000 may not be shown in the owner's manual because it is often a shared circuit with other lights and accessories.
That being said, the fuse for the high mount brake light is typically located in the engine compartment fuse box or under the dashboard fuse box. Check your owner's manual for the exact location of the fuse box in your vehicle.
Once you locate the fuse box, look for a fuse labeled "STOP" or "CHMSL" (Center High Mount Stop Lamp) or "BRAKE" that is related to the high mount brake light. Use a fuse puller or needle-nose pliers to remove the fuse and check if it has blown.
If the fuse is blown, replace it with a new fuse of the same amperage rating. If the new fuse also blows, there may be an underlying issue with the wiring or the high mount brakelight assembly itself that will require further investigation by a qualified mechanic.
Do you know how to test using a DVOM - digital volt ohm meter ? Is there B+ voltage going into the brake light switch ? An coming out when the brake pedal is pressed ? What fuse's ? There is only one fuse for the brake lights !
The BRAKE SW fuse in the RH I/P fuse block supplies battery positive voltage to the normally-open stop lamp switch. When you press the brake pedal the switch contacts close and battery positive voltage is supplied to the left and right stop lamp assemblies and to the center high mounted stop lamp (CHMSL). The left and right stop lamp along with the CHMSL are grounded at G302.
Do you know about the right insturment panel fuse box ?
Stop Lamps Inoperative
Step
Action
Yes
No
Schematic Reference: Exterior Lights Schematics
1
Did you perform the Lighting System Diagnostic System Check?
YES - Go to Step 2
NO - Go to Diagnostic System Check - Lighting Systems
2
Press the brake pedal.
Do all of the stop lamps illuminate?
YES - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
NO - Go to Step 3
3
Are all the stop lamps inoperative?
YES - Go to Step 4
NO - Go to Step 7
4
Inspect the BRK SW fuse.
Is the fuse open?
YES - Go to Step 14
NO - Go to Step 5
5
Disconnect the stop lamp switch.
Using a test lamp connected to ground, probe the battery supply voltage circuit of the stop lamp switch connector.
Does the test lamp illuminate?
YES - Go to Step 6
NO - Go to Step 13
6
Install a fused jumper between the battery supply voltage circuit and the stop lamp switch signal circuit of the stop lamp switch connector.
Do the stop lamps illuminate?
YES - Go to Step 12
NO - Go to Step 17
7
Determine if the center high mounted stop lamp is inoperative or the stop/turn lamps are inoperative.
Are the stop/turn lamps inoperative?
YES - Go to Step 8
NO - Go to Step 9
8
Do the turn lamps operate normally?
YES - Go to Step 17
NO - Go to Turn Signal Lamps and/or Indicators Inoperative
9
Disconnect the center high mounted stop lamp.
Using a test lamp connected to ground, probe the stop lamp switch signal circuit of the center high mounted stop lamp at the harness connector.
Press the brake pedal.
Does the test lamp illuminate?
YES - Go to Step 10
NO - Go to Step 15
10
Using a test lamp, probe between the stop lamp switch signal circuit and the ground circuit of the center high mounted stop lamp with a test lamp.
Press the brake pedal.
Does the test lamp illuminate?
Go to Step 11
Go to Step 16
11
Inspect for poor connections at the harness connector of the center high mounted stop lamp. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 20
Go to Step 19
12
Inspect for poor connections at the harness connector of the stop lamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 20
Go to Step 18
13
Repair a open or high resistance in the battery supply voltage circuit of the stop lamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 20
--
14
Repair a short to ground in one of the following circuits:
• The battery supply voltage circuit of the stop lamp switch
• The stop lamp switch signal circuit of the stop lamp switch
Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 20
--
15
Repair a open or high resistance in the stop lamp switch signal circuit of the center high mounted stop lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 20
--
16
Repair an open or high resistance in the ground circuit of the center high mounted stop lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 20
--
17
Repair an open or high resistance in the stop lamp switch signal circuit of the stop lamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 20
--
18
Verify the stop lamp switch adjustment. Refer to Stop Lamp Switch Adjustment . If OK, replace the stop lamp switch. Refer to Stop Lamp Switch Replacement .
Did you complete the repair?
Go to Step 20
--
19
Replace the center high mounted stop lamps. Refer to High Mount Stop Lamp Replacement .
Did you complete the repair?
Go to Step 20
--
20
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 2
Check first to verify the light fixture is getting power and if not replace the fuse for the high mount light, if it blows again disconnect the light and try another fuse, if that works then the fixture is shorted.. This is a separate fuse from the main brake lights
Turn signal/ multifunction switch. Replace it. All the exterior lights run threw it except the high mount brake light. Check the brake lights. If the high mount works and the others don't . That is a sure sign.
Year make and model helps, But, look at the lights. Are the tail/brake lights on, but not the high mount brake light? Replace the turn signal switch in the column. If the high mount is on. It could( most likelyy) be the brakes switch at the brake pedal. Could also be a shorted wire to power.
The high mount brake light has its own fuse, so check that first. The high mount bulb is generally a stabdard type (there may be more than one bulb) or you can replace with an LED. As for the left rear bulbs not working when depressing brake pedal, check the bulbs again for any spring that may be broken. If the bulbs are still good, make sure there is sufficient contact with the socket. If still not working, have someone check it out further.
Probably a short in the wire or perhaps the fuse (check under hood). If you've every removed you high mount tire rack unit, sometimes the plugs where it connects may become loose as those clips are made of plastic. Check the fuses first before taking things apart.
The jiggle method is not enough you have to look at the wires. I just did and I found out that all six wires were broken close to the splice. That splice is located close to the back seat.
Unfortunately, these are not very simple. If you have a factory high mount brake light-meaning not one in a spoiler, you have to remove the rear seats, the rear parcel shelf and then the 3rd brake light. the 3rd brake light I believe is an LED setup which get replaced as an assembly which inserts into the housing. If you need further guidance let me know.
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