DTC P0AD9-11: Hybrid/EV Battery Positive Contactor Circuit Short to Ground [10/2022 - ]: Procedure
WARNING: This page is about a different car, the 2025 Lexus RX 350h, 2024 Lexus RX 350h, and 2023 Lexus RX 350h. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BODY GROUND)
Pre-procedure1
- Disconnect the hybrid vehicle control ECU connector.
- Measure the resistance according to the value(s) in the table below.
*a Front view of wire harness connector
(to Hybrid Vehicle Control ECU)Standard Resistance
Tester Connection Condition Specified Condition Result C59-3 (SMRB) - Body ground Ignition switch off 19.0 to 59.0 Ω Ω Result
Proceed to OK NG
Post-procedure1
- Reconnect the hybrid vehicle control ECU connector.
Result:
OK
REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to REMOVAL [10/2022 - ]
Result:
NG
See step 2
- CHECK CONNECTOR CONNECTION CONDITION (FLOOR WIRE CONNECTOR)
HINT:
Refer to PROCEDURE - Step 5
Result
Result Proceed to OK A NG (The connector is not connected securely.) B NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C Result:
B
CONNECT SECURELY
Result:
C
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
A
See step 3
- CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 1 TRACTION BATTERY DEVICE BOX ASSEMBLY) WARNING:
Be sure to wear insulated gloves.
Pre-procedure1
- Check that the service plug grip is not installed.NOTE:
After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.
- Disconnect the No. 1 traction battery device box assembly connector.
- Disconnect the hybrid vehicle control ECU connector.
- Measure the resistance according to the value(s) in the table below.
*a Front view of wire harness connector
(to Hybrid Vehicle Control ECU)*b Front view of wire harness connector
(to No. 1 Traction Battery Device Box Assembly)Standard Resistance
Tester Connection Condition Specified Condition Result C59-3 (SMRB) or H23-1 (SMRB) - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ Result
Proceed to OK NG
Post-procedure1
- Reconnect the hybrid vehicle control ECU connector.
- Reconnect the No. 1 traction battery device box assembly connector.
Result:
OK
REPLACE NO. 1 TRACTION BATTERY DEVICE BOX ASSEMBLY. Refer to REMOVAL [10/2022 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
- Check that the service plug grip is not installed.