GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Corvette 🢒 Steering 🢒 Steering Wheel and Column - Tilt 🢒 Automatic Transmission Shift Lock Control Always On With Ignition in RUN

BTSI Always On With Ignition in RUN (Lock System Does Not Unlock)

Step

Action

Value(s)

Yes

No

DEFINITION: Transmission does not shift out of PARK with the brake pedal depressed and the ignition switch in ON.

1

Were you sent here from the Brake Transmission Shift Interlock System Check?

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Go to Step 2

Go to Brake Transmission Shift Interlock System Check

2
  1. Disconnect the brake transmission shift interlock (BTSI) switch connector and the brake transmission shift interlock (BTSI) control solenoid connector.
  2. Connect a DMM between the brake transmission shift interlock (BTSI) switch connector terminal B and ground.
  3. Turn the ignition switch to ON.
  4. Measure for voltage at the brake transmission shift interlock (BTSI) switch connector terminal B.

Is the voltage within the specified values?

10.0-14.0V

Go to Step 5

Go to Step 3

3
  1. Turn the ignition switch to OFF.
  2. Reconnect the brake transmission shift interlock (BTSI) switch connector.
  3. Connect a DMM between the brake transmission shift interlock (BTSI) control solenoid connector terminal C and ground.
  4. Depress the brake pedal.
  5. Measure for voltage at the BTSI control solenoid connector terminal C with the brake pedal depressed.

Is the voltage within the specified values?

10.0-14.0V

Go to Step 6

Go to Step 4

4

Replace the brake transmission shift interlock control solenoid.

Is the repair complete?

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Go to Brake Transmission Shift Interlock System Check

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5

Repair the short to battery power in CKT 1135.

Is the repair complete?

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Go to Brake Transmission Shift Interlock System Check

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6

Replace the brake transmission shift interlock (BTSI) switch.

Is the repair complete?

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Go to Brake Transmission Shift Interlock System Check

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