For 1990-2009 cars

### Circuit Description

The Vehicle speed sensor (VSS) provides vehicle speed input voltage to the instrument cluster and in turn to the cruise control module.

### Diagnostic Aids

Check for the following:

Short to ground or an open condition in the PPL/WHT wires between the instrument cluster assembly, junction block 3, and the cruise control module.

Inspect the wiring harness and components for any of the following conditions:

• | Backed out terminals.

• | Improper mating of terminals.

• | Broken electrical connectors locks.

• | Improperly formed or damaged terminals

• | Faulty terminal to wire connections.

• | Physical damage to the wiring harness.

• | A broken wire inside the insulation.

• | Corrosion of electrical connections, splices, or terminals.

Repair any electrical circuit faults that were found. Refer to Wiring Repairs .

### Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

1. This step tests for a short to ground in the PPL/WHT wire which supplies VSS signal voltage to the cruise control module.

2. This step tests for an open in the PPL/WHT wire which supplies VSS signal voltage to the cruise control module.

3. This step tests for a short to ground in the PPL/WHT wire which supplies VSS signal voltage from the instrument cluster assembly to junction block 3

4. This step tests for an open in the PPL/WHT wire which supplies VSS signal voltage from the instrument cluster assembly to junction block 3

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Cruise Control System Check performed? | -- | Go to Step 2 | Go to Cruise Control System Check
2 |

1. Turn the ignition to LOCK.
2. Disconnect the cruise control module connector located next to the instrument compartment on the RH side of the instrument panel.
3. Disconnect connector C1 on junction block 3 which is located behind the center of the instrument panel.
4. Connect a DMM set to measure resistance between terminal 12 of the cruise control module connector and ground.

Is the resistance equal to the specified value?

Infinite

Go to Step 3

Go to Step 6

3 | With the cruise control connector and connector C1 of Junction block 3 still disconnected. Connect a DMM set to measure resistance between terminal 12 of the cruise control module connector and terminal 18 of connector C1 of junction block 3.

Is the resistance within the specified range?

0-2 ohms

Go to Step 4

Go to Step 7

4 |

1. Disconnect connector C2 of junction block 3
2. Disconnect connector C2 of the instrument cluster assembly.
3. Connect a DMM set to measure resistance between terminal 19 of connector C2 of junction block 3 and ground.

Is the resistance equal to the specified value?

Infinite

Go to Step 5

Go to Step 8

5 | With connector C2 of junction block 3 and connector C2 of the instrument cluster assembly still disconnected. Connect a DMM set to measure resistance between terminal 19 of connector C2 of junction block 3 and terminal 9 of connector C2 of the instrument cluster assembly.

Is the resistance within the specified range?

0-2 ohms

Go to Step 10

Go to Step 9

6 | Repair the short to ground in the PPL/WHT wire of terminal 12 of the cruise control module connector and terminal 18 of connector C1 of junction block 3. Is the repair complete? | -- | Go to Step 11 | --
7 | Repair the open in the PPL/WHT wire of terminal 12 of the cruise control module connector and terminal 18 of connector C1 of junction block 3. Is the repair complete? | -- | Go to Step 11 | --
8 | Repair the short to ground in the PPL/WHT wire of terminal 9 of connector C2 of the instrument cluster assembly and terminal 19 of connector C2 of junction block 3. Is the repair complete? | -- | Go to Step 11 | --
9 | Repair the open in the PPL/WHT wire of terminal 9 of connector C2 of the instrument cluster assembly and terminal 19 of connector C2 of junction block 3. Is the repair complete? | -- | Go to Step 11 | --
10 |

1. Test the cruise control module connector for poor terminal contact.
2. If OK, replace the cruise control module. Refer to Cruise Control Module Replacement .

Is the replacement complete?

--

Go to Step 11

--

11 | Install and connect any components removed during diagnosis. Is the repair complete? | -- | Go to Cruise Control System Check | --