For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
DEFINITION: This table diagnoses the shift lever never being unlocked.
1 | Were you sent here from the Brake Transmission Shift Interlock System Check? | -- | Go to Step 2 | Go to Automatic Transmission Shift Lock Control System Check
2 |

1. Disconnect the shift lock control module connector.
2. Turn the ignition switch to ON.
3. Test for B+ in cavity 5 of the shift lock control module connector using a J 39200 .

Was B+ measured?

--

Go to Step 4

Go to Step 3

3 | Repair the open in the BLK/YEL wire between cavity 5 of the shift lock control module connector and cavity 9 of connector C7 of junction block 2. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Automatic Transmission Shift Lock Control System Check | --
4 | With the ignition switch still in the ON position and the shift lock control module connector still disconnected: Test for B+ in cavity 1 of the shift lock control module connector using a J 39200 . Was B+ measured? | -- | Go to Step 6 | Go to Step 5
5 | Repair the open in the GRY wire between cavity 1 of the shift lock control module connector and cavity 1 of connector C2 of the multifunction alarm module. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Automatic Transmission Shift Lock Control System Check | --
6 | With the shift lock control module connector still disconnected: Test for continuity between cavity 3 of the shift lock control module connector and ground using a J 39200 . Is there continuity in the WHT/BLK wire? | -- | Go to Step 8 | Go to Step 7
7 | Repair the open in the WHT/BLK wire between cavity 3 of the shift lock control module connector and ground. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Automatic Transmission Shift Lock Control System Check | --
8 | With the shift lock control module connector still disconnected:

1. Disconnect connector C3 of junction block 2.
2. Press the brake pedal.
3. Test for continuity between cavity 2 of the shift lock control module connector and cavity 7 of connector C3 of junction block 2 using a J 39200 .

Is there continuity?

--

Go to Step 14

Go to Step 9

9 | Test for continuity between cavity 2 of the shift lock control module connector and cavity 1 of the stoplamp switch using a J 39200 . Is there continuity in the GRN/WHT wire? | -- | Go to Step 11 | Go to Step 10
10 | Repair the open in the GRN/WHT wire between cavity 2 of the shift lock control module and cavity 1 of the stoplamp switch. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Automatic Transmission Shift Lock Control System Check | --
11 | Press the brake pedal and test for continuity between cavities 1 and 2 of the stoplamp switch using a J 39200 . Is there continuity? | -- | Go to Step 13 | Go to Step 12
12 | Replace/adjust the stoplamp switch. Refer to Stop Lamp Switch Replacement or Stop Lamp Switch Adjustment in Hydraulic Brakes. Is the adjustment or replacement complete? | -- | Go to Automatic Transmission Shift Lock Control System Check | --
13 | Repair the open in the RED/WHT wire between cavity 2 of the stoplamp switch and cavity 7 of connector C3 of junction block 2. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Automatic Transmission Shift Lock Control System Check | --
14 | Replace the shift lock control module. Refer to Shift Lock Control Module Replacement in Automatic Transmissions 3 Speed - MB3 or Shift Lock Control Module Replacement in Automatic Transmissions 4 Speed - MS7. Is the repair complete? | -- | Go to Automatic Transmission Shift Lock Control System Check | --