PRE-RELEASE
DTC B1295
| DTC B1295 |
| 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 B1295 07
Steering Wheel Controls Group 2 Signal Circuit High Voltage
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| 12V Reference | 1 | 1 | - | - |
| Steering Wheel Control Switch Signal | 1 | 1 | B1295 | - |
| 1. Steering Wheel Controls Inoperative | ||||
| 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 |
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The BCM detects a short to voltage on the signal circuit.
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The above condition is present for greater than 30 s.
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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 harness connector at the S70L Steering Wheel Controls Switch - Left .
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| 2. |
Test for less than 10 Ω between the signal circuit terminal 2 and ground.
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| 3. |
If greater than the specified value, test the signal circuits 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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| 4. |
Ignition ON, test for greater than 11 V between the 12 V reference circuit terminal 1 and ground.
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| 5. |
If less than the specified value, test the 12 V 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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| 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 9 X3 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 S70L Steering Wheel Controls Switch - Left.
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| Component Testing |
Left Steering Wheel Switch Test
| 1. |
Disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left.
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| 2. |
Turn the cruise control switch in the ON position.
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| 3. |
Test the resistance between the terminals 1 and 2.
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| 4. |
If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the S70L Steering Wheel Controls Switch - Left.
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| Function Switch | Minimum Resistance Value | Maximum Resistance Value |
| Set | 2.2 kΩ | 2.4 kΩ |
| Resume | 3.7 kΩ | 3.9 kΩ |
| Cancel | 1.4 kΩ | 1.6 kΩ |
| No Switch Pressed | 6.7 kΩ | 6.9 kΩ |
| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Radio and Telephone Control Switch Replacement
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Control Module References
for BCM replacement, setup, and programming
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