Relay Circuit Board Test

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The relay circuit board is part of the under-hood fuse/relay box, and it contains these relays:

Radiator fan relay
Fan control relay
Windshield wiper motor relay
Windshield wiper intermittent relay
Windshield wiper high/low relay
Rear window wiper motor relay

Do the battery terminal disconnection procedure (see BATTERY TERMINAL DISCONNECTION AND RECONNECTION ).
Disconnect under-hood fuse/relay box connector B (14P) and D (10P).

Fig 1: Identifying Under-Hood Fuse/Relay Box Connector B (14P) And D (10P)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Test each relay circuit as shown:
Radiator fan relay:

There should be continuity between terminals D4 and D1 when battery power is connected to terminal B13, and body ground is connected to terminal D5.

There should be no continuity between terminals D4 and D1 when power is disconnected.

Fan control relay:

There should be continuity between terminals B10 and B6 when battery power is connected to terminal B5 (or B11 or B12), and body ground is connected to terminal D5.

There should be continuity between terminals B10 and D1 when power is disconnected.

Windshield wiper motor and windshield wiper intermittent relay:

There should be battery voltage at terminal B1 when battery power is connected to terminals B8 and B4, and body ground is connected to terminals B3 and B7.

There should be no voltage at terminal B1 and body ground when terminal B7 is disconnected.

There should be battery voltage at terminal B1 and body ground when terminal B3 is disconnected.

Windshield wiper high/low relay:

There should be battery voltage at terminal B2 when battery power is connected to terminals B4 and B8, and body ground is connected to terminals B3, B7, and B9.

There should be no voltage at terminal B2 when terminal B9 is disconnected.

Rear window wiper motor relay:

There should be continuity between terminals D10 and D7 when battery power is connected to terminal D6 and body ground is connected to terminal D8.

There should be no continuity between terminals D10 and D7 when power is disconnected.

Radiator fan relay, Fan control relay

Fig 2: Radiator Fan Relay And Fan Control Relay Circuit
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 3: Rear Window Wiper Motor Relay Circuit
Courtesy of AMERICAN HONDA MOTOR CO., INC.
If any relay circuit fails the test, replace the relay circuit board.
Reinstall all removed parts.
Do the battery terminal reconnection procedure (see BATTERY TERMINAL DISCONNECTION AND RECONNECTION ).