GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Disconnect the brake transmission shift interlock (BTSI) with the ignition key in the RUN position and the shift lever in PARK.

Does the shift linkage unlock?

--

Go to Step 2

Go to Step 3

2

  1. Disconnect the torque converter clutch (TCC)/stoplamp switch connector.
  2. Connect a digital multimeter (DMM)J 35616-200 between CKT 1135 (DK GRN/WHT) cavity A at the TCC/stoplamp switch connector and ground.

Is continuity present?

--

Go to Step 4

Go to Step 5

3

Remove the BTSI solenoid assembly.

Does the shift linkage unlock?

--

Go to Step 6

Go to Automatic Transmission Repair (4L60E) or (4L80E)

4

Repair the short to voltage in CKT 1135 (DK GRN/WHT) between the TCC/stoplamp switch connector and the BTSI solenoid connector.

Is the repair complete?

--

System OK

--

5

Replace the TCC/stoplamp switch.

Is the replacement complete?

--

System OK

--

6

Replace the BTSI solenoid.

Is the replacement complete?

--

System OK

--