Navigation frequently asks for code and needs GPS initialization

Check for battery voltage on navigation unit connector C (8P) terminals No. 1 and No. 2.
Is there battery voltage?
1. YES - Go to step 2.
2. NO - Repair the circuits.
Check for continuity between navigation unit connector C (8P) terminal No. 4 and body ground.

Fig 1: Checking Continuity Between Navigation Unit Connector C (8P) Terminal No. 4 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Replace the navigation unit.
2. NO - Repair the open in the circuit.