For 1990-2009 cars

### Circuit Description

The Parking Assist System informs the driver of the system fault by warning indicator and the alarm.

• | The fault recognition by warning indicator--When the ignition switch is first turned ON, the ignition voltage is supplied from fuse F18 in I/P fuse block to find the parking assist system (PAS) control module at input terminal 1. The PAS control module respond by illuminating the warning indicator on the cluster for 4 seconds and then turning it off while the control module performs self-test on the PAS. At this time if the control module finds the malfunction in the system, the control module will continue to illuminate the warning indicator until the malfunction is removed.

• | The fault recognition by the alarm--When ignition switch is being ON, if the gear select lever is moved into "R", the PAS control module perform the self-test and ring the alarm. If system fault do not exist, control module ring the alarm just 1 time for approximately 0.3 second. If system fault exist, control module ring the alarm 3 times for approximately 1.5 seconds and that cycle is repeated 5 times.

### Diagnostic Aids

If the warning indicator is illuminated by the malfunction, perform the On-Board Diagnostic Features error check before performing the parking assist system malfunction check.

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

1. Turn the ignition ON.
2. Observe the parking assist warning indicator.

Does the indicator illuminate for 4 seconds and then off?

--

System OK

Go to Step 2

2 | Position the gear select lever into "R". Does the parking assist module ring the alarm as normal Assist Warning alarm mode (only 1 time for 0.3 second and then off)? | -- | Go to Information Center Telltale Malfunction | Go to Step 3
3 | Perform the self sensor error check. Refer to "Self Sensor Error Check". Did you find and correct the condition? | -- | Go to Step 1 | Go to Step 4
4 |

1. Disconnect the connector of parking assist alarm.
2. Turn the ignition ON.
3. Check the voltage between the supply voltage circuit of alarm wiring connector and a good ground.

Is the voltage approximately the specified value?

8 V

Go to Step 6

Go to Step 5

5 |

1. Turn the ignition OFF.
2. Disconnect the connector of parking assist control module.
3. Check for an open or a short to ground/B+ of supply voltage circuit at the alarm wiring connector.

Did you find and correct the condition?

--

Go to Step 13

Go to Step 7

6 | Check for following circuits of the alarm wiring connector for the indicated condition.

• | An open and a short to ground/B+ for signal circuit

• | An open for ground circuit

Did you find and correct the condition?

--

Go to Step 13

Go to Step 9

7 |

1. Turn the ignition OFF.
2. Check for an open or a short to ground of the ignition voltage circuit at control module wiring connector.

Did you find and correct the condition?

--

Go to Step 13

Go to Step 8

8 | Check for an open of the ground circuit at control module wiring connector. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 12
9 | Check for an open or short to ground of the circuits between the BCM and parking assist control module. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 10
10 | Check for an open or a short to ground of park brake switch circuit. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 11
11 |

1. Replace the parking assist alarm.
2. Reconnect the all PAS components.
3. Turn the ignition ON.
4. Observe the parking assist warning indicator.

Does the indicator illuminate for 4 seconds and then off?

--

Go to Step 13

Go to Step 12

12 |

1. Replace the parking assist control module.
2. Perform the BCM reprogramming procedure.

Did you complete the replacement?

--

Go to Step 13

--

13 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 1