PRE-RELEASE
DTC B1529
| DTC B1529 |
| 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 Descriptor |
DTC B1529 03
Control Module Voltage Reference Output 5 Circuit Low Voltage
DTC B1529 07
Control Module Voltage Reference Output 5 Circuit High Voltage
| Diagnostic Fault Information |
Electrical DTCs
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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12V Reference
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B1529 03, B1405 03
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1
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B1529 07
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B1529 07
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Steering Wheel Control Switch Signal
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1
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1
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B3622 07
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-
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1. Steering Wheel Controls Inoperative
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| Circuit/System Description |
The body control module (BCM) supplies voltage to the steering wheel control switches and monitors the return signal. Each switch state is associated to a set resistance value and when pressed a specific voltage drop occurs across the resistor unique to the switch. The BCM identifies the switch selection and activates the feature.
| Conditions for Running the DTC |
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The system voltage is between 9-16 V.
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The ignition is ON.
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| Conditions for Setting the DTC |
B1529 03
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The BCM detects a short to ground in the 12 V reference circuit.
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The above condition is present for greater than 30 s.
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B1529 07
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The BCM detects a short to voltage in the 12 V reference circuit.
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The above condition is present for greater than 30 seconds.
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| Action Taken When the DTC Sets |
The BCM will ignore switch inputs.
| Conditions for Clearing the DTC |
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The condition responsible for setting the DTC no longer exists.
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A history DTC will clear once 100 consecutive malfunction free ignition cycles have occurred.
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| Reference Information |
Schematic Reference
Steering Wheel Secondary/Configurable Control Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Steering Wheel Controls Description and Operation
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 Testing |
| 1. |
Ignition OFF, disconnect the X3 harness connector at the X85 Steering Wheel Air Bag Coil.
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| 2. |
Ignition ON, test for greater than 11 V between the voltage reference circuit terminal 6 X3 male side and ground.
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| 3. |
If less than the specified value, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
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| 4. |
Test for greater than 11 V between the voltage reference circuit terminal 6 X3 male side and the signal circuit terminal 7 X3 male side.
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| 5. |
If less than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
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| 6. |
Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
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| 7. |
Test for infinite resistance between the signal circuit terminal 7 X3 male side at the X85 Steering Wheel Air Bag Coil and ground.
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| 8. |
If less than the specified value, test the signal circuit for a short to ground.
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| 9. |
If all circuits test normal, test or replace the S70R Steering Wheel Controls Switch - Right.
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| Component Testing |
Static Test
| 1. |
Disconnect the harness connector at the X85 Steering Wheel Air Bag Coil.
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| 2. |
Test the resistance between the terminals 6 X3 female side and 7 X3 female side of the X85 Steering Wheel Air Bag Coil.
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| 3. |
If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the S70R Steering Wheel Controls Switch - Right.
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| Function Switch | Minimum Resistance Value | Maximum Resistance Value |
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Volume Up
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1.0 kΩ
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1.4 kΩ
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Volume Down
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1.3 kΩ
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1.7 kΩ
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SRC ↑
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1.7 kΩ
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2.2 kΩ
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SRC ↓
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2.0. kΩ
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2.8 kΩ
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Source
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2.8 kΩ
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3.2 kΩ
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Phone/Push to Talk
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3.6 kΩ
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4.0 kΩ
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Hang Up/Audio Mute
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5.1 kΩ
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5.5 kΩ
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No Switch Pressed
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O.L.
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O.L.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM replacement, setup, and programming.
