Inspection Procedure

1. Disconnect the connectors shown in the illustration from the navigation receiver assembly and speakers.
   Fig 1: Identifying Navigation Receiver Assembly Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance between each of the front No. 2 speakers and the navigation receiver assembly to check for an open circuit in the wire harness.

   Standard Resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   E1-2 (FL+) - I4-4 (+)	Always	Below 1 Ω
   E1-6 (FL-) - I4-2 (-)	Always	Below 1 Ω
   E1-1 (FR+) - H4-4 (+)	Always	Below 1 Ω
   E1-5 (FR-) - H4-2 (-)	Always	Below 1 Ω

   Fig 2: Identifying Rear Speaker Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance between each of the front No. 2 speakers and each of the front No. 1 speakers to check for an open circuit in the wire harness.

   Standard Resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   I1-1 - I4-3 (TWL+)	Always	Below 1 Ω
   I1-2 - I4-1 (TWL-)	Always	Below 1 Ω
   H1-1 - H4-3 (TWR+)	Always	Below 1 Ω
   H1-2 - H4-1 (TWR-)	Always	Below 1 Ω

4. Measure the resistance between each of the rear speakers and the navigation receiver assembly to check for an open circuit in the wire harness.

   Standard Resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   E2-2 (RL+) - L2-1	Always	Below 1 Ω
   E2-6 (RL-) - L2-2	Always	Below 1 Ω
   E2-1 (RR+) - L1-1	Always	Below 1 Ω
   E2-3 (RR-) - L1-1	Always	Below 1 Ω

5. Measure the resistance between each speaker and body ground to check for a short circuit in the wire harness.

   Standard Resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   E1-2 (FL+) - Body ground	Always	10 kΩ or higher
   E1-6 (FL-) - Body ground	Always	10 kΩ or higher
   E1-1 (FR+) - Body ground	Always	10 kΩ or higher
   E1-5 (FR-) - Body ground	Always	10 kΩ or higher
   E2-2 (RL+) - Body ground	Always	10 kΩ or higher
   E2-6 (RL-) - Body ground	Always	10 kΩ or higher
   E2-1 (RR+) - Body ground	Always	10 kΩ or higher
   E2-3 (RR-) - Body ground	Always	10 kΩ or higher
   I4-3 (TWL+) - Body ground	Always	10 kΩ or higher
   I4-1 (TWL-) - Body ground	Always	10 kΩ or higher

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   H4-3 (TWR+) - Body ground	Always	10 kΩ or higher
   H4-1 (TWR-) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Resistance check
   1. Measure the resistance between the terminals of the speaker.

   Standard Resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   I1-1 - I1-2	Always	3.2 to 4.8 Ω
   H1-1 - H1-2	Always	3.2 to 4.8 Ω

NG: REPLACE FRONT NO. 1 SPEAKER  (See REMOVAL )

OK: Go to next step 

1. Check that the malfunction disappears when another speaker in good condition is installed.

   OK: Malfunction disappears. 

   HINT:

   • Connect all the connectors to the front No. 2 speaker.
   • When there is a possibility that either the right or left front speaker is defective, inspect by interchanging the right one with the left one.
   • Perform the above inspection on both LH and RH sides.

NG: REPLACE FRONT NO. 2 SPEAKER  (See REMOVAL )

OK: Go to next step 

1. Resistance check
   1. Measure the resistance between the terminals of the speaker.

   Standard Resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   L2-1 - L2-2	Always	Approximately 4 Ω
   L1-1 - L1-2	Always	Approximately 4 Ω

NG: REPLACE REAR SPEAKER  (See ON-VEHICLE INSPECTION )

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE  (See PROBLEM SYMPTOMS TABLE )