DTC P1602-00: Deterioration of Battery Low Capacity [10/2022 - ]: Procedure
WARNING: This page is about a different car, the 2025 Toyota Highlander, 2024 Toyota Highlander, and 2023 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK CHARGING SYSTEM
Refer to ON-VEHICLE INSPECTION [10/2022 - ]
Result
Proceed to OK NG Result:
NG
REPAIR OR REPLACE CHARGING SYSTEM
Result:
OK
See step 2
- CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
- Disconnect the ECM connector.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition C89-1 (BATT) - Body ground Always 11 to 14 V *a Front view of wire harness connector
(to ECM)Result
Proceed to OK NG
Result:
OK
CHECK FOR INTERMITTENT PROBLEMS
Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR