Automatic Transmission Shift Lock Control Always On With Ignition in RUN. Pontiac Grand Prix 1999

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 1999 🢒 Grand Prix 🢒 Steering 🢒 Steering Wheel and Column - Tilt 🢒 Automatic Transmission Shift Lock Control Always On With Ignition in RUN

Step

Action

Value(s)

Yes

Important: Disable the Supplemental Inflatable Restraint (SIR) for column-mounted BTSI. Refer to Disabling the SIR and Enabling the SIR in Supplemental Inflatable Restraint System

Use the J 35616-A in order to inspect or probe a terminal in a diagnostic procedure. Use of the J 35616-A ensures that following conditions exist:

•	No damage to the terminal will occur.

•	Terminal contact tension is sufficient.

Refer to Checking Terminal Contact in Wiring Systems if terminal contact seems insufficient.

Place the transaxle in the PARK position.
Turn the ignition switch to the RUN position.
Use a test lamp in order to backprobe between the stop lamp switch connector C2 terminal A (CKT 1439) and ground.

Did the test lamp light?

Go to Step 2

Go to Step 3

Use a test lamp in order to backprobe between the stop lamp switch connector C2 terminal B (CKT 1135) and ground.

Did the test lamp light?

Go to Step 4

Go to Step 5

Inspect for the following conditions in CKT 1020 between the stop lamp switch connector C2 terminal A and the fuse block terminal C2:

•	A poor connection

•

An open

Is there a poor connection or an open?

Go to Step 18

Go to Step 19

Turn the ignition switch to the LOCK position.
Disconnect the automatic transmission shift lock control actuator (BTSI) electrical connector.
Turn the ignition switch to the RUN position.
Use a test lamp in order to backprobe between the automatic transmission shift lock control actuator (BTSI) connector terminal E (CKT 1135) and ground.

Did the test lamp light?

Go to Step 6

Go to Step 7

Inspect for a poor connection at the stop lamp switch.
If the connection is good, adjust or replace the stop lamp switch. Refer to Stop Lamp Switch Replacement and Stop Lamp Switch Adjustment for service procedure.
Inspect the BTSI system.

Is the repair complete?

Go to Automatic Transmission Shift Lock Control System Check

Use a test lamp in order to backprobe the automatic transmission shift lock control actuator (BTSI) connector terminals a (CKT 1135) and B (CKT 434).

Did the test lamp light?

Go to Step 8

Go to Step 9

Repair the following conditions in CKT 1135 between the stop lamp switch connector C2 terminal B and the automatic transmission shift lock control actuator (BTSI) connector terminal E.

•	The poor connection

•

The open

Inspect the BTSI system.

Is the repair complete?

Go to Automatic Transmission Shift Lock Control System Check

Inspect the automatic transmission shift lock control actuator (BTSI) for mechanical damage.
Replace the automatic transmission shift lock control actuator (BTSI). Refer to Automatic Transmission Shift Lock Control Disassemble - Off Vehicle and Automatic Transmission Shift Lock Control Assemble - Off Vehicle for service procedure.
Inspect the BTSI system.

Is the repair complete?

Go to Automatic Transmission Shift Lock Control System Check

Reconnect the automatic transmission shift lock control actuator (BTSI) electrical connector.
Use a test lamp in order to backprobe between the underhood accessory wiring junction block connector C1 terminal D2 (CKT 434) and B+.

Did the test lamp light?

Go to Step 10

Go to Step 11

Use a test lamp in order to backprobe between the underhood accessory wiring junction block connector C2 terminal C11 and B+.

Did the test lamp light?

Go to Step 12

Go to Step 13

Disconnect the transaxle range switch connector C1.
Use a test lamp in order to frontprobe between the transaxle range switch connector C1 terminal D (CKT 1050) and B+.

Did the test lamp light?

Go to Step 14

Go to Step 15

Repair the following conditions in CKT 434 between the automatic transmission shift lock control actuator (BTSI) connector terminal A and the underhood accessory wiring junction block connector C2 terminal B3:

•	A poor connection

•

An open

Inspect the BTSI system.

Is the repair complete?

Go to Automatic Transmission Shift Lock Control System Check

Inspect for a poor connection at the underhood accessory wiring junction block.
Replace the underhood accessory wiring junction block. Refer to Accessory Wiring Junction Block Replacement for service procedure.
Inspect the BTSI system.

Is the repair complete?

Go to Automatic Transmission Shift Lock Control System Check

Inspect CKT 434 for the following conditions between the underhood accessory wiring junction block connector C1 terminal D2 and the transaxle range switch connector C1 terminal A:

•

An open

•	A poor connection

Is there an open or a poor connection?

Go to Step 16

Go to Step 17

Repair the following conditions in CKT 1050 between the transaxle range switch connector C1 terminal D and G117:

•	A poor connection

•

An open

Inspect the BTSI system.

Is the repair complete?

Go to Automatic Transmission Shift Lock Control System Check

Repair the following conditions in CKT 434 between the underhood accessory wiring junction block connector C1 terminal D2 and the transaxle range switch connector C1 terminal A:

•	The poor connection

•

The open

Inspect the BTSI system

Is the repair complete?

Go to Automatic Transmission Shift Lock Control System Check

Inspect for a poor connection at the transaxle range switch.
Replace or adjust the transaxle range switch. Refer to Stop Lamp Switch Replacement or Stop Lamp Switch Adjustment for service procedure.
Inspect the BTSI system.

Is the repair complete?

Go to Automatic Transmission Shift Lock Control System Check

Repair the following conditions in CKT 1020 between the stop lamp switch connector C2 terminal A and the fuse block terminal C2:

•	The poor connection

•

The open

Inspect the BTSI system.

Is the repair complete?

Go to Automatic Transmission Shift Lock Control System Check

Repair the following conditions in CKT 1390 between the fuse block terminal C1 and connector C201 terminal C1:

•	A poor connection

•

An open

Inspect the BTSI system.

Is the repair complete?

Go to Automatic Transmission Shift Lock Control System Check