Calibration Criteria
This procedure is only for vehicles equipped with a Battery Sensor Module. Attempting to run this procedure without a Battery Sensor Module may cause unwanted results. If this occurs, the BCM will need to be reset with an ignition cycle.
The battery sensor module is attached directly to the negative battery terminal and is used to determine the battery condition by calculating the battery state of charge, state of function, and state of health. The battery condition is used to help determine if the 12 volt stop/start system will allow a stop/start event to occur when the vehicle has come to a stop.
To determine the battery condition, the battery sensor module must be calibrated. In normal operation, all current entering or exiting the battery flows through the battery sensor module and is monitored. Any action which charges or discharges the battery that is not monitored by the battery sensor module will require the calibration procedure be performed. Such instances are:
- The battery was replaced by a battery with the same part number
- The battery was replaced by a battery with a different part number or different specifications
- The battery was recharged while outside the vehicle
- The battery was discharged while outside the vehicle
- The battery was improperly charged:
To properly charge the battery, the negative lead of the charger must be connected to chassis ground, NOT directly to the negative battery post. Connecting to chassis ground allows current to flow through the battery sensor module during charging and be measured. Connecting directly to the negative battery post charges the battery, but the current is not measured by the battery sensor module.
If any of these conditions have occurred, the battery sensor module must be calibrated to maintain proper 12 volt start/stop operation.