Data Signal Circuit between Navigation Receiver Assembly and Extension Module [10/2015 - ]: Procedure

1. Disconnect the W7 and W4 navigation receiver assembly connectors.
2. Disconnect the W9 and W5 stereo component tuner assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   W7-1 (USV4) - W9-1 (USV4)	Always	Below 1 Ω
   W7-2 (US4-) - W9-2 (US4-)	Always	Below 1 Ω
   W7-3 (US4+) - W9-3 (US4+)	Always	Below 1 Ω
   W7-4 (UGD4) - W9-4 (UGD4)	Always	Below 1 Ω
   W7-5 (USG4) - W9-5 (USG4)	Always	Below 1 Ω
   W4-4 (+B2) - W5-4 (+B2)	Always	Below 1 Ω
   W4-3 (ACC2) - W5-3 (ACC2)	Always	Below 1 Ω
   W4-8 (GND2) - W5-8 (GND2)	Always	Below 1 Ω
   W7-1 (USV4) - Body ground	Always	10 kΩ or higher
   W7-2 (US4-) - Body ground	Always	10 kΩ or higher
   W7-3 (US4+) - Body ground	Always	10 kΩ or higher
   W7-4 (UGD4) - Body ground	Always	10 kΩ or higher
   W7-5 (USG4) - Body ground	Always	10 kΩ or higher
   W4-4 (+B2) - Body ground	Always	10 kΩ or higher
   W4-3 (ACC2) - Body ground	Always	10 kΩ or higher
   W4-8 (GND2) - Body ground	Always	10 kΩ or higher

   Result	Proceed to
   	OK
   	NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

1. Replace the No. 1 navigation wire with a known good one.

   Refer to REMOVAL [10/2015 - ] .

2. Check that the malfunction disappears.

   OK

   Malfunction disappears.

   Result	Proceed to
   	OK
   	NG

Result: 

OK 

END (NO. 1 NAVIGATION WIRE IS DEFECTIVE) 

Result: 

NG 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2015 - ]  .