Toyota Yaris: Charging System / Battery Monitor Module General Electrical Failure (P058A01)

Toyota Yaris XP210 (2020-2026) Reapir and Service Manual / Power Source & Network / G16e-gts (battery / Charging) / Charging System / Battery Monitor Module General Electrical Failure (P058A01)

DESCRIPTION

The battery state sensor assembly detects the voltage, current and temperature of the auxiliary battery. The charging condition is calculated from the voltage and current and output to the ECM. The ECM sends an instruction to generate voltage to the generator assembly based on that signal. Also, the auxiliary battery temperature is calculated from the change in the resistance value of the thermistor built into the battery state sensor assembly and output to the ECM. The ECM reduces the charging current when the auxiliary battery is hot and protects the auxiliary battery based on this signal.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Note
P058A01	Battery Monitor Module General Electrical Failure	Any of the following conditions is met with the ignition switch ON. (1 trip detection logic): Current value is 999.939 A or higher or -1000 A or less for 3.2 seconds or more. Difference between maximum and minimum current value is 0.0305 A or less for 100 seconds or more. Current detection circuit malfunction condition is received. Auxiliary battery temperature is 105°C or higher or -40°C or lower for 3.2 seconds or more. Temperature detection circuit malfunction condition is received. Voltage value remains at 15.98 V or higher or 6.0 V or less for 3.2 seconds or more. Voltage detection circuit malfunction condition is received. Battery state sensor assembly internal memory write malfunction (battery identification information) occurs.	Battery state sensor assembly Wire harness or connector Auxiliary battery	Does not come on	SAE Code: P058A

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.
When P162B87 (Lost Communication with Battery Monitor Module Missing Message) is output at the same time, perform the inspection for P162B87 (Lost Communication with Battery Monitor Module Missing Message) first.
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PROCEDURE

1.	CHECK BATTERY STATE SENSOR ASSEMBLY INSTALLATION

HINT:

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INSTALL BATTERY STATE SENSOR ASSEMBLY CORRECTLY

2.	CHECK CHARGING SYSTEM

HINT:

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REPAIR OR REPLACE CHARGING SYSTEM

3.	CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Disconnect the battery state sensor assembly connector.

*a	Front view of wire harness connector (to Battery State Sensor Assembly)

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
O68-3 (+B) - Body ground	Always	11 to 14 V
O68-1 (RBAT) - Body ground	Always	11 to 14 V

REPLACE BATTERY STATE SENSOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

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