DTC B15CC: Backup Battery Failure: Procedure

1. Turn the ignition switch off.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch to ON and wait for 10 seconds.
4. Turn the Techstream on.
5. Perform "HEALTH CHECK" and check for current DTCs. Refer to HEALTH CHECK .
   RESULT
   
   

   Result	Proceed to
   DTC B15CC is output	A
   DTC B15CC is not output	B

B → See step   7 

A: Go to next step 

1. Disconnect the D73 DCM (Telematics Transceiver) connector.
   Fig 1: Checking Harness And Connector (DCM - BUB)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the D76 BUB (Back-Up Battery) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D73-30 (BBI+) - D76-1 (BBO+)	Always	Below 1 Ω
   D73-13 (BBI-) - D76-5 (BBO-)	Always	Below 1 Ω
   D73-20 (CTR1) - D76-3 (BTR1)	Always	Below 1 Ω
   D73-21 (CTR2) - D76-4 (BTR2)	Always	Below 1 Ω
   D73-30 (BBI+) - Body ground	Always	10 kΩ or higher
   D73-13 (BBI-) - Body ground	Always	10 kΩ or higher
   D73-20 (CTR1) - Body ground	Always	10 kΩ or higher
   D73-21 (CTR2) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to DCM (Telematics Transceiver))
   *2	Front view of wire harness connector (to BUB (Back-Up Battery))

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the BUB (Back-Up Battery) with a normal one and check if the same problem occurs again. Refer to REMOVAL .
   NOTE:

   The BUB (Back-Up Battery) must not be replaced while an ACN call is in progress. Refer to ACN CALL END .

NEXT: Go to next step 

1. Clear the DTC. Refer to DTC CHECK / CLEAR .

NEXT: Go to next step 

1. Recheck for DTCs and check if the same trouble occurs again. Refer to HEALTH CHECK .

   OK

   No DTC is output.

NG → See step   6 

OK → END 

1. Replace the DCM (Telematics Transceiver). Refer to REMOVAL .
   NOTE:

   • The ignition switch must be off.
   • Do not swap the DCM (Telematics Transceiver) with one from another vehicle.

NEXT → See step   8