DTC P0AA1 (46)

DTC P0AA1  : HV Battery Main Contactor Circuit Stuck Closed

NOTE: 

• Before you troubleshoot, review the general troubleshooting information .
• Do not clear the DTC until the diagnosis has been completed. Otherwise, there is a possibility that the high-voltage sub contactor can get damaged if the DTC is cleared and the vehicle turned to the ON mode.

DTC (Electric Powertrain)

1. Determine possible failure area (short in PRE line, others)

   -1. Remove the service plug and the IPU cover .

   -2. Disconnect the following connector.

   Battery condition monitor module connector E (32P)

   -3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Battery condition monitor module connector E (32P): disconnected
   Test point 1	Battery condition monitor module connector E (32P) No. 6
   Test point 2	Body ground

   Is there continuity?

   YES 

   Go to step 2.

   NO 

   Go to step 3.

2. Shorted wire check (PRE line)

   -1. Remove the IPU and the IPU case .

   -2. Disconnect the following connector.

   Junction board 4P connector

   -3. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Battery condition monitor module connector E (32P): disconnected
   	Junction board 4P connector: disconnected
   Test point 1	Battery condition monitor module connector E (32P) No. 6
   Test point 2	Body ground

   Is there 1 MΩ or more?

   YES 

   The PRE wire is OK. Replace the junction board .

   NO 

   Repair a short in the PRE wire between the battery condition monitor module (E6) and the junction board.

3. Determine possible failure area (short in CNTP line, others)

   -1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Battery condition monitor module connector E (32P): disconnected
   Test point 1	Battery condition monitor module connector E (32P) No. 4
   Test point 2	Body ground

   Is there continuity?

   YES 

   Go to step 4.

   NO 

   Go to step 5.

4. Shorted wire check (CNTP line)

   -1. Disconnect the following connector.

   Junction board 4P connector

   -2. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Battery condition monitor module connector E (32P): disconnected
   	Junction board 4P connector: disconnected
   Test point 1	Battery condition monitor module connector E (32P) No. 4

   Test point 2

   Body ground

   Is there 1 MΩ or more?

   YES 

   The CNTP wire is OK. Replace the junction board .

   NO 

   Repair a short in the CNTP wire between the battery condition monitor module (E4) and the junction board.

5. Junction board check

   -1. Remove the junction board .

   -2. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   Test point 1	Junction board terminal (A)
   Test point 2	Junction board terminal (B)

   Courtesy of HONDA, U.S.A., INC.

   Is there 45 Ω or less?

   YES 

   There is a failure in the high voltage contactor or the bypass contactor. Replace the junction board .

   NO 

   Replace the battery condition monitor module .