PRE-RELEASE
DTC B0685
| DTC B0685 |
| 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 B0685 02
Security System Indicator Circuit Short to Ground
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| Control | B0685 02 | 1 | 1 | - |
| Low Reference | - | B0163 05, B0183 05 | - | - |
| 1. Security Indicator Malfunction | ||||
| Circuit/System Description |
The security LED is controlled by the body control module (BCM) based on commands from the content theft deterrent system. The security LED is located in the dash as part of the ambient light sensor and is supplied ground at all times. When the content theft deterrent system requests the LED be commanded ON, the BCM applies voltage to the security indicator control circuit, illuminating the LED.
| Conditions for Running the DTC |
The system voltage is between 9-16 V.
| Conditions for Setting the DTC |
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The BCM detects a short to ground on the security indicator control circuit.
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The above condition exist for 1 second.
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| Action Taken When the DTC Sets |
Security LED output is disabled
| Conditions for Clearing the DTC |
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A current DTC is cleared when the conditions for setting the DTC are no longer present.
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A history DTC will clear after 40 malfunction free ignition cycles.
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| Reference Information |
Schematic Reference
Theft Deterrent System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Content Theft Deterrent (CTD) 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 Verification |
Arm the content theft deterrent system. The security LED should illuminate and/or flash during the arming sequence.
| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the harness connector at the B10B Ambient Light/Sunload Sensor.
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| 2. |
Test for less than 10 Ω between the low reference circuit terminal 6 and ground.
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| 3. |
If greater than the specified range, test the low reference circuit for an open/high resistance.
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| 4. |
Connect a test lamp between the control circuit terminal 1 and ground.
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| 5. |
Ignition ON, command the security indicator ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
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| 6. |
If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
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If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
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| 8. |
If all circuits test normal, replace the B10B Ambient Light/Sunload Sensor.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Sun Load Temperature and Daytime Running Lamp Ambient Light Sensor Replacement
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Control Module References
for BCM replacement, programming and setup
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