PRE-RELEASE
DTC B2745
| DTC B2745 |
| 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 B2745 02
Traction Control Switch Circuit Short to Ground
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| Traction Control Switch Signal | B2745 02 | 1 | 1 | - |
| Traction Control Switch Ground | - | 1 | - | - |
| 1. Traction Control Switch Malfunction | ||||
| Circuit/System Description |
The body control module monitors the signal circuit for the traction control contact from the Sport Mode switch. When the switch is actuated once, the body control module sends a serial data message to the electronic control module for the brakes, requesting deactivation of traction control.
When the traction control switch is held down for 5 seconds, the body control module asks the electronic control module for the brakes to deactivate stability control. The electronic control module for the brakes then sends a serial data message to the instrument cluster requesting that the indicators showing traction control off and stability control off to be turned on so that the driver can see that deactivation has taken place.
| Conditions for Running the DTC |
Ignition ON.
| Conditions for Setting the DTC |
The body control module detects a short to ground on the traction control signal circuit.
| Action Taken When the DTC Sets |
The body control module ignores the traction control switch signal input.
| Conditions for Clearing the DTC |
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The condition for setting the DTC is no longer present.
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The DTC in the history is deleted after 40 consecutive fault-free ignition cycles.
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| Reference Information |
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
ABS 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 |
| 1. |
Ignition ON
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| 2. |
Observe the parameter for the body control module's traction control contact on the diagnostic tool when this contact is depressed and released. The reading should change between Active and Inactive.
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| 3. |
If the reading does not change between Active and Inactive:
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| 4. |
Refer to Circuit/System Testing below.
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| 5. |
If the reading changes between Active and Inactive:
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| 6. |
All OK
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| Circuit/System Testing |
| 1. |
Ignition OFF, all vehicle systems OFF. Disconnect the connector at the S109 Sport Mode switch. It may take up to 2 minutes for all vehicle systems to power down.
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| 2. |
Test for less than 5 Ω between the ground circuit pin 5 and ground.
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| 3. |
If the reading is 5 Ω or higher:
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| 3.1. |
Ignition OFF.
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| 3.2. |
Test for less than 2 Ω in the ground circuit, end to end.
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| 3.3. |
If the reading is 2 Ω or higher, rectify open circuit/high resistance
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| 3.4. |
If the reading is lower than 2 Ω rectify open/high resistance at ground connection.
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| 4. |
If the reading is lower than 5 Ω:
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| 5. |
Ignition ON.
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| 6. |
Confirm via the diagnostic tool that the parameter for the body control module traction control contact is Inactive.
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| 7. |
If the parameter is not Inactive:
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| 7.1. |
Ignition OFF, disconnect X2 cable connector at K9 body control module.
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| 7.2. |
Test for infinite resistance between the signal circuit and ground.
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| 7.3. |
If the reading is less than infinite, rectify short circuit to ground in the circuit.
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| 7.4. |
If the resistance is infinite, replace K9 body control module.
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| 8. |
If the parameter is Inactive:
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| 9. |
Install a 3A fused jumper wire between the signal circuit terminal 9 and ground.
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| 10. |
Confirm that the diagnostic tool parameter for the body control module traction control switch is Active.
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| 11. |
If the parameter is not Active:
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| 12. |
Ignition ON,
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| 13. |
If not the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the K9 body control module.
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| 14. |
If the parameter is not Active:
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| 14.1. |
Ignition OFF, disconnect X2 cable connector at K9 body control module - ignition ON.
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| 14.2. |
Test for lower than 1 V between the signal circuit and ground
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| 14.3. |
If the reading is 1 V or higher, rectify short circuit to voltage in the circuit.
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| 14.4. |
If the reading is lower than 1 V:
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| 14.5. |
Test for less than 2 Ω in the signal circuit end to end.
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| 14.6. |
If the reading is 2 Ω or higher, rectify open circuit/high resistance in the circuit.
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| 14.7. |
If the reading is lower than 2 Ω, replace K9 body control module.
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| 15. |
If the parameter is Active:
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| 16. |
Test or replace the sport mode contact S109.
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| Component Testing |
| 1. |
Ignition OFF, disconnect the harness connector at the S109 Sport Mode Switch.
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| 2. |
Test whether the resistance between the signal circuit pin 9 and the ground circuit pin 5 is infinite when the contact is in open position.
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| 3. |
If the resistance is lower than infinite:
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| 4. |
Replace the sport mode contact S109.
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| 5. |
Test that the resistance is lower than 2 Ω between the signal circuit pin 9 and the ground circuit pin 5 when the contact is closed.
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| 6. |
If the reading is 2 Ω or higher:
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| 7. |
Replace the sport mode contact S109.
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| 8. |
If the reading is lower than 2 Ω:
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| 9. |
All OK
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the repair.
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Accessory Switch Replacement
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Control Module References
for replacement, programming and setup of K9 body control module
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