Question about 2001 Hyundai XG300

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Hyundai Grandeur 2000 , stalling when brakes are applied If stoplight switch is disconnected is OK If stoplight globes are removed engine will cut out Thanks if you have any suggestions

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  • Jeff Turcotte
    Jeff Turcotte May 19, 2011

    brake light wire is shorted to frame

  • info37028 May 19, 2011

    the fault is not there if the stoplight switch is disconnected therefore must be an electrical fault

    What do you think, thanks

  • info37028 May 19, 2011

    stoplights work OK

  • info37028 May 22, 2011

    Traced the fault to idle speed ECU located under stereo unit in centre dash
    Cheers Chris

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After looking at the diagram, it is possible to have a short in 1 of 2 places, Look in the trunk for anything that may have crushed or is pinning the wiring harness against the body. The other idea is that going to the shifter. When you apply the brake it should activate a shift lock solenoid so you can shift into drive. If that has gotten wet or pinched in the centre console somehow it could back feed and cause a problem. Has someone hooked a radio up lately?

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Posted on May 20, 2011

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Welcome to Fixya

There is a vacuum booster check valve that is most likely the problem. It is located between the brake booster and the intake .It can be checked,by removing it and try and blow threw it at both ends of the valve,if it blows free threw,when you blow threw it,then it is defective.The valve is only supposed to go one way.It will allow air to be sucked threw towards the engine only.This keeps all the vacuum in the booster.

Try to check/clean the throttle body. Clogged throttle body sometimes causes this problem.

Thank you for using Fixya!

Posted on May 19, 2011

  • Jose Cada
    Jose Cada May 19, 2011

    checked for shorted brake light wires.

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94 merc grandmarkee wont go into park wont start will start if you wiggle in nutral


Park neutral safety switch could be bad , also the shift interlock safety system .
Shift Interlock System A brake/shifter interlock system consists of the following:
  • ignition switch (11572)
  • brake pedal stoplight switch (13480)
  • brake shift interlock module
  • brake shift interlock solenoid assembly (attached to key interlock assembly)
  • necessary wiring
On floor-shift vehicles, the ignition/shifter interlock cable (3F719):
  • locks the floor shift transaxle range selector lever in the PARK position when the ignition switch is in the LOCK position.
  • requires the floor shift transaxle range selector lever to be in the PARK position to turn the ignition switch to the LOCK position.
Condition Possible Source Action
  • Shift Interlock System Does Not Release or Lock Properly
  • Circuitry open/shorted.
  • Blown fuse.
  • Damaged stoplight switch.
  • Damaged shift lock actuator.
  • GO to Pinpoint Test A .

PINPOINT TEST A: SHIFT INTERLOCK SYSTEM DOES NOT RELEASE OR LOCK PROPERLY A1 CHECK ELECTRON IGN FUSE
  • Check Fuse 5 (5A) located in fuse junction panel.
Is fuse OK?
Yes No GO to A3 . GO to A2 . A2 CHECK FOR SHORT TO GROUND
  • Turn ignition switch OFF.
  • Remove Fuse 5 (5A).
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  • Measure resistance of the Circuit 1003 (GY/Y) between the correct terminal of Fuse 5 (5A) and ground.
Is resistance greater than 10,000 ohms?
Yes No REPLACE Fuse 5 (5A). GO to A3 . SERVICE Circuit 1003 (GY/Y) wire between fuse junction panel and shift-lock actuator. A3 CHECK POWER SUPPLY FROM FUSE 5 (5A)
  • Reinstall Fuse 5 (5A).
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  • Measure voltage on Circuit 1003 (GY/Y) wire and ground.
Is voltage greater than 10 volts?
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  • Turn ignition switch OFF.
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  • Turn ignition switch ON.
  • Measure voltage on Circuit 10 (LG/R) and ground.
Is voltage B+?
Yes No GO to A5 . SERVICE Circuit 10 (LG/R) for open. RESTORE vehicle and RETEST system. A5 CHECK WIRE BETWEEN STOPLIGHT SWITCH AND SHIFT-LOCK ACTUATOR
  • Turn ignition switch OFF.
  • Disconnect shift-lock actuator connector C203.
  • Apply brake pedal.
  • Measure voltage on Circuit 810 (R/LG) wire and ground.
Is voltage greater than 10 volts with brake pedal applied and less than 1 volt with brake pedal released?
Yes No GO to A6 . SERVICE Circuit 810 (R/LG) wire between stoplight switch and shift-lock actuator. A6 CHECK SHIFT-LOCK ACTUATOR GROUND
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Hello,

REMOVAL

  1. Disconnect the wire harness at the connector from the stoplight switch.
NOTE: Locking tab on connector must be lifted before connector can be removed.
  1. Remove the hairpin retainer and slide the stoplight switch, the push rod and the nylon washers and bushing away from the brake pedal. Remove the stoplight switch by sliding the stoplight switch up/down as required to remove.
NOTE: Since the stoplight switch side plate nearest the brake pedal is slotted, it is not necessary to remove the brake master cylinder push rod and one spacer washer from the brake pedal pin.

INSTALLATION
  1. Position stoplight switch so that the U-shaped side is nearest the brake pedal and directly over or under the pin. Then slide stoplight switch down or up trapping the master cylinder push rod and black bushing between the stoplight switch side plates. Push stoplight switch and push rod assembly firmly toward brake pedal arm. Assemble outside white plastic washer to pin and install hairpin retainer to trap whole assembly.
CAUTION: Do not substitute other types of pin retainers. Replace only with a production hairpin retainer. Component damage may occur.
  1. Assemble the wire harness connector to the stoplight switch.
NOTE: Stoplight switch wire harness must have sufficient length to travel with stoplight switch during full stroke of brake pedal. If wire length is insufficient, reroute harness or service as required.
  1. Check stoplight switch for proper operation.

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When a vehicle's brake lights all go out at the same time, the culprit is usually the
"stoplight Switch" which is operated by depressing the brake pedal.

To replace a stoplight switch, first determine what type of switch you have.
If you have an electrical switch mounted to the brake pedal in the passenger compartment:
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  • Unplug the wires.
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archaeology_14.jpg

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