Power Source Circuit [11/2021 - ]: Procedure

1. Choose the model to be inspected.

   Result

   Result	Proceed to
   for HEV Model	A
   for Gasoline Model	B

Result: 

B 

See step  3

Result: 

A 

See step  2

1. Disconnect the D21 combination meter assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Combination Meter Assembly)

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   D21-5 (B) - Body ground	Ignition switch off	11 to 14 V
   D21-6 (IG+) - Body ground	Ignition switch off	Below 1 V
   D21-6 (IG+) - Body ground	Ignition switch ON	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

See step  5

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the D21 combination meter assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Combination Meter Assembly)

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   D21-6 (IG+) - Body ground	Ignition switch off	Below 1 V
   D21-6 (IG+) - Body ground	Ignition switch ON	10.5 to 16 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO STOP AND START SYSTEM. Refer to  Backup Boost Converter Circuit [11/2021 - 03/2023]  , or refer to  Backup Boost Converter Circuit [03/2023 - ] 

Result: 

OK 

See step  4

1. Disconnect the D21 combination meter assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Combination Meter Assembly)

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   D21-5 (B) - Body ground	Always	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D21-1 (EP) - Body ground	Always	Below 1 Ω
   D21-2 (ES) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR