For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 |

• | Ensure that the ignition switch is in RUN.

• | Ensure that the gear selector is in park.

• | Ensure that stoplamp/BTSI switch connector C1 is disconnected.

• | Press the brake pedal and hold.

• | Move the gear selector to NEUTRAL.

Does the gear selector shift to neutral?

--

Go to Step 3

Go to Step 2

2 |

• | Ensure that the shift interlock actuator is disconnected.

• | Connect the test lamp between terminal A (DK GRN/WHT) and ground. Refer to Troubleshooting with a Test Lamp in Wiring Systems.

Does the test lamp light?

--

Go to Step 7

Go to Step 5

3 |

• | Test stoplamp/BTSI switch connector C1 for proper terminal contact.

• | Repair the connector as necessary. Refer to Connector Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 4

--

4 | Replace the stoplamp/BTSI switch. Refer to Brake Transmission Shift Interlock Replacement in Automatic Transmission - 4T65-E or to Brake Transmission Shift Interlock Solenoid Replacement in Automatic Transmission - 4T80-E. Is the repair complete? | -- | Go to Automatic Transmission Shift Lock Control System Check | --
5 |

• | Test shift interlock actuator connector for proper terminal contact.

• | Repair the connector as necessary. Refer to Connector Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 6

--

6 | Replace shift interlock actuator. Is the repair complete? | -- | Go to Automatic Transmission Shift Lock Control System Check | --
7 | Repair a short to B+ in CKT 1135 (DK GRN/WHT). Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Automatic Transmission Shift Lock Control System Check | --