B2486

DTC B2486

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions)provides an overview of each diagnostic category.

DTC Descriptor
DTC B2486 03
- Device Power Circuit Voltage Below Threshold

DTC B2486 07
- Device Power Circuit Voltage Above Threshold

Diagnostic Fault Information





Circuit/System Description

The climate control seat module (CCSM) monitors the system voltage to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the voltage is out of range.

Conditions for Running the DTC

The ignition is ON

Conditions for Setting the DTC

* The control module detects a system voltage less than 9 V for 5 seconds.
* The control module detects a system voltage greater than 18 V for 5 seconds.

Action Taken When the DTC Sets

The CCSM will disable the heat or cool seat function for the current ignition cycle.

Conditions for Clearing the DTC

The current DTC clears when the malfunction is no longer present and the power mode changes to OFF then back to ACC or RUN.

Diagnostic Aids

* A low voltage DTC in multiple modules indicates a concern in the charging system.
* A low voltage value in multiple modules indicates a concern in the charging system.
* Inspect the CCSM ground connection, to verify that it is clean tight.

Reference Information
Schematic Reference

Heated/Cooled Seat Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

Heated/Cooled Seats Description and Operation (Heated/Cooled Seats)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information

Circuit/System Verification

1. Engine running measure and record the voltage at the battery terminals. Verify that the battery voltage is 12.6-15.5 V.

• If the battery voltage is not within the specified range, refer to Charging System Test (Charging System Test).

2. Observe the scan tool CCSM Ignition 1 Signal parameter. The reading should be between 12.6 and 15.5 V.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connectors at the CCSM.
2. Ignition OFF, test for less than 5 Ohms between the ground circuit terminal M X1.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between the ignition/B+ circuit terminals listed below and ground.

* Terminal E X1
* Terminal 1 X2

• If the test lamp does not illuminate , test the Ignition/B+ circuits for a short to ground or an open/high resistance.

4. If all the circuits test normal, replace the CCSM.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

Control Module References (Programming and Relearning)for CCSM replacement, setup, and programming.