Safety and SecurityDTC B0685
DTC B0685
Diagnostic Instructions
DTC Descriptor
| DTC B0685 02: Security Indicator Circuit Short
to Ground |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Security LED Control
|
B0685 02
|
1
|
1
|
-
|
Ground
|
-
|
1
|
-
|
-
|
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 at least 9 V and no more than 16 V.
Conditions for Setting the DTC
| • |
The BCM detects a short to
ground on the security indicator control circuit. |
| • |
The above condition exist for
1 s. |
Action Taken When the DTC Sets
Security LED output is disabled.
Conditions for Clearing the DTC
| • |
A current DTC is cleared when
the conditions for setting the DTC are no longer present.
|
| • |
A history DTC will clear after
40 malfunction free ignition cycles. |
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
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
| 1. |
Ignition OFF. Arm the content
theft deterrent system. |
| 2. |
Verify that the security LED
should illuminate and/or flash during the arming sequence.
|
⇒ If not
OK
Refer to Circuit/System Testing.
⇓ If
OK
| 3. |
Verify DTC B0685 does not
set. |
⇒ If DTC B0685 does
set
Refer to Circuit/System testing.
⇓ If DTC does not
set
Circuit/System Testing
| 1. |
Ignition OFF, disconnect the
harness connector at the B10B Ambient Light/Sunload Sensor.
|
| 2. |
Test for less than 10 Ω
between the ground circuit terminal 6 and ground. |
⇒ If 5 Ω or
greater
| |
2.2 |
Test for less than 2 Ω
in the ground circuit end to end. |
| ⇒ |
If 2 Ω or greater, repair the open/high resistance in the
circuit. |
| ⇒ |
If less than 2 Ω, repair the open/high resistance in the
ground connection. |
⇓ If less than 5
Ω
| 3. |
Ignition ON, connect a test
lamp between the control circuit terminal 1 and the ground circuit
terminal 6. |
| 4. |
Verify the test lamp turns ON
and OFF when Commanding the Security Indicator Lamp ON and OFF with
a scan tool. |
⇒ If the test lamp
is always OFF
| |
4.1 |
Ignition OFF, disconnect the
harness connector at the K9 Body Control Module. |
| |
4.2 |
Test for infinite resistance
between the control circuit and ground. |
| ⇒ |
If less than infinite resistance, repair the short to ground on
the circuit. |
| |
4.3 |
Test for less than 2 Ω
in the control circuit end to end. |
| ⇒ |
If 2 Ω or greater, repair the open/high resistance in the
circuit. |
| ⇒ |
If less than 2 Ω, replace the K9 Body Control
Module. |
⇒ If the test lamp
is always ON
| |
4.1 |
Ignition OFF, disconnect the
harness connector at the K9 Body Control Module. |
| |
4.2 |
Ignition ON, test for less
than 1 V between the control circuit and ground. |
| ⇒ |
If 1 V or greater, repair the short to voltage on the
circuit. |
| ⇒ |
If less than 1 V, replace the K9 Body Control Module. |
⇓ If the test lamp
turns ON and OFF
| 5. |
Replace the B10B Ambient
Light/Sunload Sensor. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
Control Module References for BCM replacement, setup, and
programming
|
|
15 General
