Hybrid Battery Control System

DTC P1600 Back Up Power Source Circuit Malfunction

CIRCUIT DESCRIPTION

DTC Detecting Condition:

Battery positive voltage is supplied to terminal AM of the Battery ECU even when the ignition switch is OFF to read the DTC memory and freeze frame data adaptive control value memory, etc.

HINT: If DTC P1600 appears, the Battery ECU does not store any other DTC.

Wiring Diagram:

Step 1 - 2:

INSPECTION PROCEDURE

HINT: Read freeze frame data using a TOYOTA hand-held tester or OBD II scan tool. Because freeze frame data records the battery condition when the malfunction is detected. When troubleshooting, this is useful for knowing the battery condition.