Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC B2486 03: Device Power Circuit Voltage Below ThresholdDTC B2486 07: Device Power Circuit Voltage Above Threshold
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
IGN I | B2486 03 | B2486 03 | -- | -- |
Ground | -- | B2486 03 | -- | -- |
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
Connector End View Reference
Description and Operation
Heated/Cooled Seats Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Engine running measure and record the voltage at the battery terminals. Verify that the battery voltage is 12.6-15.5 V.
- Observe the scan tool CCSM Ignition 1 Signal parameter. The reading should be between 12.6 and 15.5 V.
| ⇒ | If the battery voltage is not within the specified range, refer to Charging System Test. |
Circuit/System Testing
- Ignition OFF, disconnect the harness connectors at the CCSM.
- Ignition OFF, test for less than 5 Ω between the ground circuit terminal M X1.
- Ignition ON, verify that a test lamp illuminates between the ignition/B+ circuit terminals listed below and ground.
- If all the circuits test normal, replace the CCSM.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| • | 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. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for CCSM replacement, setup, and programming.
