Suzuki Swift AT/Won't shift from Park unless AC is OFF

[ninjababez]

Car: Suzuki Swift 1.2L AT 2015
Problem:
Unable to press the shifter button to change gear, unless AC is OFF

Brief history:

issue started after non casa body repair was done (rear collision)
apparently, the shop was not able to seal the 3rd brake light properly, hence shorting occured.
after replacing the fuse, shifter worked fine for a day. but since it the replacements were popping as soon as it was installed (next day), i decided on installing a higher rated fuse temporarily (10A to 20A)*i know, wrong move*; just up until the next day where i have a time to have it fixed.

after electrician (non-casa) replaced the brake switch, and rewired the 3rd brake light (grounded due to water intrusion);
brake switch is OK (but was still replaced)
everything works normally, except that i have to make sure AC is OFF; if AC is ON, there's no way for me to shift from PARK (button is hard to press).
NOW even if the AC is OFF, unless i UNLOCK the Shift LOCK; there is no way for me to move it from PARK

I still have the original, working brake switch; should i return it?
car is with my other boss, and downtime (leaving in casa for diagnostic, is not an optio)
no CEL btw

[dr. d]

sounds like the problem is "cross-wire syndrome", probably at the fusebox area...
try this... remove one fuse at a time, and see if the problem "improves" each time one is removed.
i know... non-logical.. but the procedure is free.

[ninjababez]

sounds like the problem is "cross-wire syndrome", probably at the fusebox area...
try this... remove one fuse at a time, and see if the problem "improves" each time one is removed.
i know... non-logical.. but the procedure is free.

youre correct bro, pero ginawa na yan nung electician with me. doubtful ako nun tinutulungan ko sya, pero um oo ako, kasi gusto nga daw nya ma isolate.

[mina_nuka]

Check for power at the O/B orange/black wire at the brake light switch. If there is power, check if power goes through G/B green black wire at the brake switch with the brake pedal pressed. This is done with the transaxle shifter is in the P position. Then check for power at the shift interlock solenoid.

[dr. d]

Check for power at the O/B orange/black wire at the brake light switch. If there is power, check if power goes through G/B green black wire at the brake switch with the brake pedal pressed. This is done with the transaxle shifter is in the P position. Then check for power at the shift interlock solenoid.

i like this guy!
...knows his stuff.

[ninjababez]

Check for power at the O/B orange/black wire at the brake light switch. If there is power, check if power goes through G/B green black wire at the brake switch with the brake pedal pressed. This is done with the transaxle shifter is in the P position. Then check for power at the shift interlock solenoid.

Salamat mina
Pag pinabasa ko ba ito sa reys electrical na tech, ma gets kaya nila ito agad?

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[oj88]

Check for power at the O/B orange/black wire at the brake light switch. If there is power, check if power goes through G/B green black wire at the brake switch with the brake pedal pressed. This is done with the transaxle shifter is in the P position. Then check for power at the shift interlock solenoid.

You can skip the first test. Just check that the brake lights are working when you step on the brakes. That will confirm that the brake light circuit is energized and the brake switch is working.

[mina_nuka]

You can skip the first test. Just check that the brake lights are working when you step on the brakes. That will confirm that the brake light circuit is energized and the brake switch is working.

There are two brake switches.




One

For the brake lights


Another for the shift lock release on this car.




Some cars have two,
one for the brake lights

The other
for PCM input to cancel the torque converter clutch.

[ninjababez]

Mga bros salamat sa reply
Ito pala yun orig brake switch (hope this helps you guys help me identify my trouble)
Do you think permanent unlock nalang sa shift lock ang solution? Una kasi as long as AC is off, ok lang eh
Ngayon maski off ang AC, ayaw talaga

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[yapoy86]

Mga bros salamat sa reply
Ito pala yun orig brake switch (hope this helps you guys help me identify my trouble)
Do you think permanent unlock nalang sa shift lock ang solution? Una kasi as long as AC is off, ok lang eh
Ngayon maski off ang AC, ayaw talaga

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Looks like an ordinary brake switch... have you tried disconnecting the 3rd brake lamp? Baka may wire na exposed or naipit shorting the circuit when it was repaired.. also check voltage at actuator

[ninjababez]

Looks like an ordinary brake switch... have you tried disconnecting the 3rd brake lamp? Baka may wire na exposed or naipit shorting the circuit when it was repaired.. also check voltage at actuator

San yun actuator bro?
Btw 3rd brake light is fine, may isang busted bulb lang
Ok lang kaya lagyan ko nalang yun shift lock ipitan ko nalang?
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[yapoy86]

San yun actuator bro?
Btw 3rd brake light is fine, may isang busted bulb lang
Ok lang kaya lagyan ko nalang yun shift lock ipitan ko nalang?
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Yung actuator ng shift lock. You can hear it click when you press the brake.. assuming na electric yung shift lock.. sa picanto kasi cable type

[ninjababez]

magkaka problema kaya kung ipitan nalang shift lock, habang intay parts replacement / repair?

[thebook452]

did you fix this issue?

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did you fix this issue? ano nangyari

[ninjababez]

did you fix this issue?

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did you fix this issue? ano nangyari

wala sa akin auto at the moment. will update the thread

[mina_nuka]

Not resolved yet?



Try tapping a wire from the brake switch straight to the shift lock solenoid without going through the BCM, a dedicated circuit, if you will. If everything else work normally but this shift release, this procedure would be the most expedient without spending more time and replacement BCM

[ninjababez]

Not resolved yet?



Try tapping a wire from the brake switch straight to the shift lock solenoid without going through the BCM, a dedicated circuit, if you will. If everything else work normally but this shift release, this procedure would be the most expedient without spending more time and replacement BCM

may diagram ka bro?

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Not resolved yet?



Try tapping a wire from the brake switch straight to the shift lock solenoid without going through the BCM, a dedicated circuit, if you will. If everything else work normally but this shift release, this procedure would be the most expedient without spending more time and replacement BCM

kahit drawing lang hehehe

[oj88]

Not resolved yet?



Try tapping a wire from the brake switch straight to the shift lock solenoid without going through the BCM, a dedicated circuit, if you will. If everything else work normally but this shift release, this procedure would be the most expedient without spending more time and replacement BCM

I would advice against any additional electrical hack. Just physically disable the shift-lock solenoid. Solenoids, like relays, requires a flyback diode. If you know what you're doing, you can do the above mod, but if not, you could still fry the BCM if you just connect it directly to the brake circuit.

[ninjababez]

Thanks
Sobrang hassle kasi
Magkano kaya kung bcm ang pagawa or yun mga na mention dito?

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[oj88]

Thanks
Sobrang hassle kasi
Magkano kaya kung bcm ang pagawa or yun mga na mention dito?

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Sayang lang na bakit hindi sa casa pinaayos in the first place? The car is 2 y/o and usually, comprehensive insurance allows you to have your car repaired at the dealer for the first 3 to 5 years.

Anyway, it won't be cheap to have the BCM replaced. I'm not even sure it can be repaired. The easy way out is to disable the A/T lock-out, but it's possible that the BCM has already developed other issues. The BCM controls almost everything electrical and electronic (horn, interior and exterior lights, central lock, factory alarm, wipers, A/C, etc.... except for anything to do with engine and powertrain management (that's the ECM/PCM's job).

The BCM is usually integrated with the fuse, junction, and relay box, located under the dashboard, and typically replaced as a whole. It will look something like this:

[img]https://c.76.my/Malaysia/suzuki-swift-fuse-box-junction-36780-72k11-36770-72k11-senhuiauto-1307-16-senhuiauto*1.jpg[/img]