Question about 1999 Lexus RX 300

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Brake lamps inop

Bulbs are okay and gear selector releases, cruise control cancels when brake is pressed, suspect relay. where is it located?

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  • rolfv Jun 21, 2009

    Is there more than one switch at the brake pedal? Is it adjustable?

    There doesn't seem to be any relay involved.



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DId you Check the back up switch on the brake pedal

Posted on Jun 21, 2009


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Overdrive light flashing, won't shift from first to second unless let off gas pedal

Transmission Control Switch (TCS)
The transmission control switch (TCS) is a momentary contact switch that allows the driver to cancel operation of 5th (overdrive) gear.
The TCS is located on the end of the selector lever.
When the driver initially presses the TCS a signal is sent to the powertrain control module (PCM).
The PCM uses the shift solenoids to disengage/disable 5th gear operation and activate the coast clutch.
At the same time the PCM illuminates the transmission control indicator lamp (TCIL), to notify the driver that 5th gear is canceled.
When the TCS is pressed again, 5th gear operation is enabled, the coast clutch is released and the TCIL is turned off.
Whenever the ignition is cycled (vehicle shut off then started again) the TCS is turned off and 5th gear will be enabled, even if the TCS had been on when the ignition was shut off.
Transmission Control Indicator Lamp (TCIL)
The transmission control indicator lamp (TCIL) is located in the instrument panel and is labeled O/D OFF. It is illuminated in conjunction with the transmission switch (TCS).
The TCIL will flash if the EPC solenoid circuit is shorted or a fault has been detected in a monitored sensor used for transmission operation.

Powertrain Control Module (PCM)
The operation of the transmission is controlled by the powertrain control module (PCM). Many input sensors provide information to the PCM. The PCM then controls actuators which determine transmission operation.

Mar 18, 2018 | Ford Cars & Trucks

1 Answer

My reverse lights and my brake lights will not work with the anti theft light on in the dash

These lights are all computer controlled ! Several modules involved DIM - dash integrated module , RIM - rear integrated module .They share information on serial data communication network . Class 2 an or GMLAN !
The rear fuse block supplies battery positive voltage through the REVERSE LAMP fuse to the coil and switch terminals of the reverse lamp relay. The DIM sends a power mode message to the RIM indicating that the ignition is in the ON position. When the driver of an automatic transmission equipped vehicle places the gear selector in the REVERSE position, the powertrain control module (PCM) sends a class 2 message to the RIM. The message indicates that the gear selector lever is in the REVERSE position. When the driver places a manual transmission equipped vehicle in reverse the reverse gear position switch mounted on the transmission closes. This provides a ground for the reverse gear position switch signal line, informing the RIM that the transmission is in reverse. For both automatic and manual transmission vehicles the RIM then grounds the control circuit of the reverse lamp relay . This energizes the reverse lamp relay, closing the switch side contacts and providing battery positive voltage to the backup lamp bulbs. The backup lamps are permanently grounded at G402. With both power and ground the backup lamp bulbs illuminate. Once the driver moves the shift lever out of the reverse position a message is send either by class 2 by the PCM or the reverse gear position switch opens causing the RIM to remove the ground from the reverse lamp relay control circuit. This opens the contacts in the relay turning OFF the backup lamps.
This is something best left to the dealer or a ASE certified repair shop . Need a factory or professional grade scan tool to diagnose an repair this .

Feb 20, 2016 | 2006 Cadillac CTS 3.6

2 Answers

Installed led tailghts [ 4]cruise stopped working book says I need LED relay where can I get this-do I need 4 one for each lite

I am wondering which book told you this?

An led lamp that is designed to operate from 12 volts consumes far less current than the conventional lamp and so no conventional relay would be needed.

A single led requires much less than the 12 volt supply and if connected directly it would be damaged but by wiring many in a combination of series and parallel circuits and perhaps with a series resistor reliable operation is achieved. The benefits of led lamps is they operate cooler and consume less current and are not sensitive to vibration or thermal shock like standard bulbs.

It is the reduced current that is a problem. On-car systems such as bulb-check systems and anything that might be connected to the stop lights measure the current each circuit consumes and expect to "see" the current used by a couple of bulbs flowing along the wire. Led lamps will not cause even the current of half a bulb to flow and so the concerned systems become confused and useless.

I suspect the "relay" is simply a device to fool the on-car systems into believing there are still bulbs in the lamps, perhaps simply by consuming current.
I think you will need to ask questions of the people who supplied the led lamps...

Nov 04, 2015 | Cars & Trucks

1 Answer

R/L brake lights inop

If you replaced the brake switch at the foot pedal and it still doesn't work... both lights. Then you have a broken ground wire... both lamps feed from the same ground. If only one was working then you could suspect a live wire to just that lamp.

Mar 10, 2015 | 2002 Hyundai Santa Fe

1 Answer

Gear shift Selector stuck

These were known for having faulty brake light switche that would cause that problem as well as cruise control inop. I would check that first. It operates the shift-lock solenoid which releases the shifter. There were also some problems with the ignition switches, but mostly on the gm cars.

Feb 13, 2014 | 2008 Chevrolet Avalanche LTZ

1 Answer

Inoperative brake and tail lights

cars dont have relays for brake lights as its too low power.
If you have power across the switch you may want to check the connections to the bulb holders and then check the bulbs themselves.
If no power at bulb holders you need to check the loom which, unless you have had some welding or similar disruption would be very odd.
Check for a good earth at rear bulb holders too, quite oftena poor earth will cause many faults.

Feb 03, 2018 | Ford Focus Cars & Trucks

1 Answer

2002 gmc yukon denali xl, cruise control inop after installing l.e.d. taillamp assemblies, know it is a resistance problem, where and what rating of resistor should i install?

It is not a resistance problem. As it operates normally, the cruise control is wired to the stop lamps and will operate only when it sees chassis ground through the stop lamps. When you tap your brake pedal, 12 volts is applied, the ground goes away and cruise is deactivated. Because the LED tails are diodes and only let current flow one way, the cruise cannot see ground and will not set or operate. The same symtoms would appear if you had original incandescent tail lamps and both brake lights were burned out.
The solution will be finding the wire from the cruise that senses the brake lights, and connecting it directly to the brake switch, IF the brake switch is grounded when the pedal is not pressed. You may have a relay wired to the brake pedal switch to make this happen. Seek a knowledeable car audio/accesory shop familiar with auto electrical to help you with this.
Good luck!

May 02, 2010 | 2002 GMC Yukon Denali

2 Answers

I own a 2005 GMC Canyon Five CYL and the cruise control stopped working last niight. You push the button and no cruise. I checked the fuse and it is ok I exchanged with another 10AMP and no change still...

Start with the simple and check the fuses and the Stop lamp switch. Check your brake lights, if they're not working, the cruise won't work either. If they're not working, check the fuse for them, if the fuse is fine, then take it into the dealer, there's been a recall issued on the brake switch, so it should get fixed for free.
Cruise Control Disengaged
The powertrain control module (PCM) disengages the cruise control operation based on the signals from the following switches:

* The stop lamp switch
* The TCC brake/cruise release switch
* The clutch release switch, if equipped
* The cruise control On/Off switch

The TCC brake/cruise release switch and the stop lamp switch are mounted on the brake pedal bracket. When the brake pedal is applied, the normally closed TCC brake/cruise release switch opens and the normally open stop lamp switch closes. The PCM detects a low signal voltage on the TCC brake/cruise release switch signal circuit and a high signal voltage on the stop lamp switch signal circuit. When the clutch pedal is applied, the normally closed clutch release switch opens and the PCM detects zero voltage on the CCP switch signal circuit. The vehicle speed stored in the memory of the PCM will be erased when the cruise control On/Off button is turned OFF, or the ignition switch is turned OFF.

The Cruise Control System will disengage when the PCM detects that a driver override function has been active for approximately 60 seconds .

When the Cruise Control System is disengaged, the PCM sends a class 2 message to the instrument panel cluster (IPC) in order to deactivate the cruise control indicator.

Cruise Control Inhibited
The powertrain control module (PCM) inhibits the cruise control operation when any of the following conditions exist:

* A cruise control related DTC has been set.
* The vehicle speed is less than 40.2 km/h (25 mph) .
* The vehicle is in PARK, REVERSE, NEUTRAL, or 1st gear.
* The engine RPM is too low.
* The engine RPM is too high, with fuel cut off.
* The vehicle speed is too high, with fuel cut off.
* The system voltage is not between 9 volts and 16 volts .
* The Traction Control System (TCS) is active for more than 2 seconds .

Thank you for using Fixya and start with replacing the stop lamp switch. Even though the brake light work, it;s been known for that switch to cause your issue. that's way there was a recall for it.

Apr 01, 2010 | 2005 GMC Canyon

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