PRE-RELEASE
DTC B1405
| DTC B1405 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptors |
DTC B1405 02
Control Module Voltage Reference Output 2 Circuit Short to Ground
DTC B1405 03
Control Module Voltage Reference Output 2 Circuit Low Voltage
DTC B1405 07
Control Module Voltage Reference Output 2 Circuit High Voltage
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| 8 V Reference | B1405 02 | B0954 06, B0955 06, B0956 06, B0957 06, B0958 06, B0959 06, B0960 06, B0961 06, B1405 03 | B0954 06, B0955 06, B0956 06, B0957 06, B0958 06, B0959 06, B0960 06, B0961 06, B1405 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 |
| Left Rear Object Sensor Signal | B0958 06 | B0958 06 | B0958 01 | B0958 08, B0959 21 |
| Left Middle Rear Object Sensor Signal | B0959 06 | B0959 06 | B0959 01 | B0959 08, B0959 21 |
| Right Middle Rear Object Sensor Signal | B0960 06 | B0960 06 | B0960 01 | B0960 08, B0958 21 |
| Right Rear Object Sensor Signal | B0961 06 | B0961 06 | B0961 01 | B0961 08, B0961 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 parking assist control module supplies 8 V to the object sensors via the 8 V reference circuit and provides ground via the low reference circuit. The parking assist control module triggers the sensors in a sequential loop. After each sensor transmits, the parking assist control module uses the sensor echo received through the signal circuit to calculate the distance and position of an object.
| Conditions for Running the DTC |
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Ignition ON
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The parking assist is activated. The activation takes place through putting in the reverse gear or through operating the parking assist switch.
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| Conditions for Setting the DTC |
B1405 02
The parking assist control module has detected the 8 V reference circuit is shorted to ground.B1405 03
The parking assist control module has detected the 8 V reference circuit is less than 6.3 V.B1405 07
The parking assist control module has detected the 8 V reference circuit is greater than 10.4 V.| Action Taken When the DTC Sets |
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The parking assist is disabled.
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The driver information center displays SERVICE PARK ASSIST.
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| 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 (UVC) Object Detection Description and Operation (UD5)
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Verification |
Ignition ON, activate the parking assist, observe the scan tool Park Assist Sensor Reference Voltage parameter. The reading should be between 6.3-10.4 V.
| Circuit/System Testing |
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Ignition OFF, disconnect the harness connector at each of the object sensors.
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Start at the B78G rear object sensor-left outer, ignition ON, activate the park assist, test for 6.3-10.4 V between the 8 V reference circuit terminal 1 at the object sensor harness connector and ground.
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If less than the specified range, test the 8 V reference circuit for a short to ground. If the circuit tests normal, replace the K41 parking assist control module.
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If greater than the specified range, test the 8 V reference circuit for a short to voltage. If the circuit tests normal, replace the K41 parking assist control module.
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Install each object alarm sensor harness connector one at a time, checking DTCs after each sensor is connected. Verify DTC B1405 is not set as current.
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If the DTC is set, replace the object alarm sensor that was connected immediately before the DTC set.
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If all circuits test normal, replace the K41 parking assist control module. |
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Front Parking Assist Alarm Sensor Replacement
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Rear Parking Assist Alarm Sensor Replacement
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Control Module References
for parking assist control module replacement, programming and setup
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