For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptor

DTC B0954 01: Parking Aid Front Sensor Left Corner Circuit Short to Battery
DTC B0954 01: Parking Aid Front Sensor Left Corner Circuit Short to Battery
DTC B0954 08: Parking Aid Front Sensor Left Corner Circuit Performance - Signal Invalid
DTC B0954 21: Parking Aid Front Sensor Left Corner Circuit Incorrect Period
DTC B0954 3A: Parking Aid Front Sensor Left Corner Circuit Incorrect Component Installed
DTC B0955 01: Parking Aid Front Sensor Left Middle Circuit Short to Battery
DTC B0955 06: Parking Aid Front Sensor Left Middle Circuit Low Voltage/Open
DTC B0955 08: Parking Aid Front Sensor Left Middle Circuit Performance - Signal Invalid
DTC B0955 21: Parking Aid Front Sensor Left Middle Circuit Incorrect Period
DTC B0955 3A: Parking Aid Front Sensor Left Middle Circuit Incorrect Component Installed
DTC B0956 01: Parking Aid Front Sensor Right Middle Circuit Short to Battery
DTC B0956 06: Parking Aid Front Sensor Right Middle Circuit Low Voltage/Open
DTC B0956 08: Parking Aid Front Sensor Right Middle Circuit Performance - Signal Invalid
DTC B0956 21: Parking Aid Front Sensor Right Middle Circuit Incorrect Period
DTC B0956 3A: Parking Aid Front Sensor Right Middle Circuit Incorrect Component Installed
DTC B0957 01: Parking Aid Front Sensor Right Corner Circuit Short to Battery
DTC B0957 06: Parking Aid Front Sensor Right Corner Circuit Low Voltage/Open
DTC B0957 08: Parking Aid Front Sensor Right Corner Circuit Performance - Signal Invalid
DTC B0957 21: Parking Aid Front Sensor Right Corner Circuit Incorrect Period
DTC B0957 3A: Parking Aid Front Sensor Right Corner Circuit Incorrect Component Installed

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
8 V Reference | B0954 06, B0955 06, B0956 06, B0957 06 --

B0958 06,

B0959 06,

B0960 06,

B0961 06,

--

B138A 03

B0954 06,

B0955 06,

B0956 06,

B0957 06

--

B0958 06,

B0959 06,

B0960 06,

B0961 06,

B0954 06,

B0955 06,

B0956 06,

B0957 06

--

B0958 06,

B0959 06,

B0960 06,

B0961 06,

--

B138A 07

--

Left Front Object Sensor Signal | B0954 06 | B0954 06 | B0954 01 | B0954 08, B0954 21
Left Middle Front Object Sensor Signal | B0955 06 | B0955 06 | B0955 01 | B0955 08, B0955 21
Right Middle Front Object Sensor Signal | B0956 06 | B0956 06 | B0956 01 | B0956 08, B0956 21
Right Front Object Sensor Signal | B0957 06 | B0957 06 | B0957 01 | B0957 08, B0957 21
Low Reference | -- | B0954 06, B0955 06, B0956 06, B0957 06 --

B0958 06,

B0959 06,

B0960 06,

B0961 06

--

--

### Circuit/System Description

The object sensors are 3-wire sensors that are used to determine the distance between the vehicle and an object of interest. The object alarm module supplies 8 V to the object sensors via the 8 V reference circuit and provides ground via the low reference circuit. The object alarm module triggers the sensors in a sequential loop. After each sensor transmits, the object alarm module uses the sensor ring received through the signal circuit to calculate the distance and position of an object.

### Conditions for Running the DTC

• | Ignition ON

• | The park assist is activated. The activation takes place through putting in the reverse gear or through operating the park assist switch.

### Conditions for Setting the DTC

#### B0954 01, B0955 01, B0956 01, or B0957 01

The object alarm module has detected the voltage at the sensor circuit is greater than 11.5 V.

#### B0954 06, B0955 06, B0956 06, or B0957 06

The object alarm module has detected the voltage at the sensor circuit is less than 0.5 V.

#### B0954 08, B0955 08, B0956 08, or B0957 08

The object alarm module has received an invalid signal.

#### B0954 21, B0955 21, B0956 21, or B0957 21

The object sensor determines no change in the position of an object while the vehicle is in motion.

#### B0954 3A, B0955 3A, B0956 3A, or B0957 3A

The object alarm module determines the wrong sensor type is installed.

### Action Taken When the DTC Sets

• | The parking assist is disabled.

• | The park assist indicator in the instrument panel cluster will be activated.

### Conditions for Clearing the DTC

The condition for setting the DTC is no longer present.

### Reference Information

#### Schematic Reference

Object Detection Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Object Detection Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

1. Verify that DTC B138A 03 or B138A 07 is not present.

⇒ | If DTC is present, refer to DTC B138A.

2. Verify that DTC B0954 3A, B0955 3A, B0956 3A or B0957 3A is not present.

⇒ | If DTC is present, replace the respective sensor with a sensor of correct sensor type.

3. Verify that DTC B0954 21, B0955 21, B0956 21 or B0957 21 is not present.

⇒ | If DTC is present, check the respective sensor for contamination by mud, ice or snow. If no contamination is diagnosed, replace the sensor.

### Circuit/System Testing

1. Ignition OFF for 30 s, disconnect the harness connector at the appropriate front object sensor.
2. Test for less than 5 Ω between the low reference circuit terminal 2 and ground.

⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K41 Object Alarm Module.

3. Ignition ON, activate the park assist, test for 7.5-9.0 V between the 8 V reference circuit terminal 1 and ground.

⇒ | If less than the specified range, test the 8 V reference circuit for an open/high resistance. If the circuit tests normal, replace the K41 Object Alarm Module.

4. Ignition OFF, remove the malfunctioning object sensor and swap locations with another properly functioning front object sensor. Connect the harness connector at both sensors.
5. Ignition ON, verify the DTC is set for the new location in which the malfunctioning sensor is installed.

⇒ | If the DTC does not set for the new location, test the signal circuit terminal 3 for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the K41 Object Alarm Module.

⇒ | If the DTC sets for the new location in which the malfunctioning sensor is installed, replace the appropriate front object sensor.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Front Object Alarm Sensor Replacement

• | Control Module References for Object Alarm Module replacement, setup and programming