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

Important: 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:

Check the BTSI PARK LOCK fuse for an open.

Is the BTSI PARK LOCK fuse open?

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Go to Automatic Transmission Shift Lock Control System Check

Go to Step 2

1. Place transaxle in the PARK position.
2. Turn ignition switch to the RUN position.
3. Using a test lamp, connect by backprobing between the stop lamp switch connector C2 terminal A circuit 1439 and ground.

Does the test lamp illuminate?

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Go to Step 3

Go to Step 4

Using a test lamp, connect by backprobing between the stop lamp switch connector C2 terminal B circuit 1135 and ground.

Does the test lamp illuminate?

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Go to Step 5

Go to Step 16

Check for poor connection or open in circuit  1439.

Is there a poor connection or open in circuit 1439?

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Go to Step 13

Go to Step 14

1. Turn ignition switch to the LOCK position.
2. Disconnect the automatic transmission shift lock control actuator (BTSI) electrical connector.
3. Turn ignition switch to the RUN position.
4. On Century: Using a test lamp, connect between the automatic transmission shift lock control actuator (BTSI) connector terminal A circuit 1135 and ground.
5. On Regal: Using a test lamp, connect between the automatic transaxle control (BTSI) connector terminal E circuit 1135 and ground.

Does the test lamp illuminate?

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Go to Step 6

Go to Step 12

1. On Century: Using a test lamp, connect between the automatic transmission shift lock control actuator (BTSI) connector terminals A circuit 1135 and B circuit 434.
2. On Regal: Using a test lamp, connect between the automatic transaxle control (BTSI) connector terminals E circuit 1135 and A circuit 434.

Does the test lamp illuminate?

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Go to Step 17

Go to Step 7

1. Disconnect the transaxle range switch connector C1.
2. Using a test lamp, connect between the transaxle range switch connector C1 terminal D circuit 1050 and B+.

Does the test lamp illuminate?

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Go to Step 8

Go to Step 10

Check for poor connection or open in circuit 434.

Is there a poor connection or open in circuit 434?

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Go to Step 11

Go to Step 15

Repair sort to ground in circuit 1439 or circuit 1135.

Is the repair complete?

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Go to Automatic Transmission Shift Lock Control System Check

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Repair poor connection or open in circuit 1050.

Is the repair complete?

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Go to Automatic Transmission Shift Lock Control System Check

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Repair poor connection or open in circuit 434.

Is the repair complete?

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Go to Automatic Transmission Shift Lock Control System Check

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Repair poor connection or open in circuit 1135.

Is the repair complete?

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Go to Automatic Transmission Shift Lock Control System Check

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Repair poor connection or open in circuit 1439.

Is the repair complete?

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Go to Automatic Transmission Shift Lock Control System Check

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Repair poor connection or open in circuit 3.

Is the repair complete?

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Go to Automatic Transmission Shift Lock Control System Check

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Replace the transaxle range switch. Refer to Park/Neutral Position Switch Replacement for service procedure.

Is the repair complete?

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Go to Automatic Transmission Shift Lock Control System Check

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Replace the stop lamp switch. Refer to Stop Lamp Switch Replacement for service procedure.

Is the repair complete?

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Go to Automatic Transmission Shift Lock Control System Check

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

Is the repair complete?

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Go to Automatic Transmission Shift Lock Control System Check

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