For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Were you sent here from the Backup Lamps System Check? | -- | Go to Step 2 | Go to Backup Lamp System Check
2 | Does the vehicle have an automatic transaxle? | -- | Go to Step 3 | Go to Step 4
3 |

1. Turn the ignition switch to the ON position.
2. Disconnect the park/neutral position (PNP) switch connector.
3. Using a J 35616-200 probe the corresponding cavities of the appropriate drivetrain:

• | cavity 4 (4 SP A/T)

• | cavity 6 (3 SP A/T)

Does the test lamp illuminate?

--

Go to Step 10

Go to Step 5

4 |

1. Turn the ignition switch to the ON position.
2. Disconnect the backup lamp switch connector.
3. Using a J 35616-200 probe cavity 2 of the backup lamp switch.

Does the test lamp illuminate?

--

Go to Step 11

Go to Step 6

5 | Using a J 35616-200 backprobe SP258 C2 to ground. Does the test lamp illuminate? | -- | Go to Step 7 | Go to Step 9
6 | Using a J 35616-200 backprobe SP258 C2 to ground. Does the test lamp illuminate? | -- | Go to Step 8 | Go to Step 9
7 | Repair the open in the RED/BLU wire between the SP258, C2 and the park/neutral position switch connector. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Backup Lamp System Check | --
8 | Repair the open in the RED/BLU wire between the SP258, C2 and the backup lamp switch connector cavity 2. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Backup Lamp System Check | --
9 | Repair the open in the RED/BLU wire between cavity C1 of SP258 and cavity 9 of connector C2 of junction block 2. refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Backup Lamp System Check | --
10 | With the park/neutral position switch connector still disconnected;

1. Put the vehicle into reverse.
2. Test for continuity using a J 39200 between cavities:

• | 4 and 8 (4 SPD A/T)

• | 5 and 6 (3 SPD A/T)

Is there continuity?

--

Go to Step 14

Go to Step 12

11 | With the Park/Neutral position switch connector still disconnected;

1. Put the vehicle into reverse.
2. Test for continuity using a J 39200 between cavities 1 and 2 of the backup lamp switch.

Is there continuity?

--

Go to Step 15

Go to Step 13

12 | Replace the Park/Neutral position switch. Refer to Park/Neutral Position Switch Replacement in Automatic Transmission. Is the replacement complete? | -- | Go to Backup Lamp System Check | --
13 | Replace the backup lamp switch. Refer to Backup Lamp Switch Replacement . Is the replacement complete? | -- | Go to Backup Lamp System Check | --
14 | Test for continuity using a J 39200 between cavity 9 of connector C3 of junction block 1 and connector cavities:

• | 8 (4 SPD A/T)

• | 5 (3 SPD A/T)

Is there continuity?

--

Go to Step 18

Go to Step 16

15 | Test for continuity using a J 39200 between cavity 9 of connector C3 of junction block 1 and connector cavity 1 of the backup lamp switch. Is there continuity? | -- | Go to Step 18 | Go to Step 17
16 | Repair the open in the RED/BLK wire between cavity 9 of connector C3 of junction block 1 and the park/neutral position switch (PNP) connector. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Backup Lamp System Check | --
17 | Repair the open in the RED/BLK wire between cavity 9 of connector C3 of junction block 1 and cavity 1 of the backup lamp switch. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Backup Lamp System Check | --
18 | Repair the open in the RED/BLK wire between the junction block 1, connector C3 cavity 9 and SP450. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Backup Lamp System Check | --