Power Source Circuit: Procedure

1. Disconnect the E3 (*1)/E18 (*2) connector.
   Fig 1: Identifying Clock Assembly Wire Harness Connector Terminal E3

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   E3-1 (B) (*1) - Body ground	Always	10 to 14 V
   E18-1 (B) (*2) - Body ground	Always	10 to 14 V
   E3-10 (ACC) (*1) - Body ground	Engine switch on (ACC)	10 to 14 V
   E18-2 (ACC) (*2) - Body ground	Engine switch on (ACC)	10 to 14 V

   *1: without Navigation System

   *2: with Navigation System

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

   Standard resistance

   Tester Connection	Condition	Specified Condition
   E3-18 (GND) (*1) - Body ground	Always	Below 1 Ω
   E18-8 (E) (*2) - Body ground	Always	Below 1 Ω

   *1: without Navigation System

   *2: with Navigation System

   Result

   Result	Proceed to
   OK (without Navigation System)	A
   OK (with Navigation System)	B
   NG	C

   HINT: 

   The whole heater control panel (*1)/multi-display should be replaced if the clock assembly has a malfunction because this part is not independently supplied.

C → REPAIR OR REPLACE HARNESS OR CONNECTOR 

B → REPLACE MULTI-DISPLAY 

A → REPLACE HEATER CONTROL PANEL