DTC 6-4: Backup Battery Connection Error: Procedure

Fig 1: Identifying P3 And P4 Connector End View Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the P3 ECU connector.
2. Disconnect the P4 battery connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P3-2 (BBI+) - P4-1 (BBO+)	Always	Below 1 Ω
   P3-9 (BBI-) - P4-2 (BBO-)	Always	Below 1 Ω
   P3-2 (BBI+) or P4-1 (BBO+) - Body ground	Always	10 kΩ or higher
   P3-9 (BBI-) or P4-2 (BBO-) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR THEN CLEAR HISTORIC DTC 

OK: Go to next step 

1. Replace the mayday battery. Refer to REMOVAL .
2. Perform registration. Refer to REGISTRATION - Step 4 .
3. Check for DTC again. Refer to DTC CHECK / CLEAR .

   OK

   No DTCs output.

NG → REPLACE TELEPHONE ECU ASSEMBLY THEN PERFORM REGISTRATION 

OK → See step   3