Relay Circuit Board Removal, Installation, and Test: Test

Courtesy of HONDA, U.S.A., INC.

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

• Brake light relay circuit
• Electric heater coolant pump relay circuit
• Electric VTC relay circuit
• Ignition coil relay circuit
• PGM-FI main relay 1 circuit
• PGM-FI subrelay circuit
• RFC diode
• Security horn circuit diode
• Security horn relay circuit

NOTE: 

• Make sure the correct test lead (+ or -) is placed on the terminal.
• When checking for continuity across the diode, use the diode setting ( ) on the digital volt/ohm meter to check the diode bias.
• Note this important operating characteristic; diode bias causes a diode to fully conduct electricity in one direction (forward), while not at all in the opposite direction (reverse).

Electric Heater Coolant Pump Relay Circuit, Electric VTC Relay Circuit, and RFC Diode 

Electric heater coolant pump relay circuit

• There should be continuity between terminals C15 and C7, when 12 volt battery power is connected to terminal C6, and body ground is connected to terminal C8.
• There should be no continuity between terminals C15 and C7 when terminal C8 is disconnected.

Electric VTC relay circuit

• There should be battery voltage at terminal B5 when 12 volt battery power is connected to terminal B4, and body ground is connected to terminal C2.
• There should be no voltage at terminal B5 when terminal C2 is disconnected.

RFC diode

• There should be continuity between terminals A1 and A2.

Courtesy of HONDA, U.S.A., INC.

Brake Light Relay Circuit, Security Horn Relay Circuit, and Security Horn Circuit Diode 

Brake light relay circuit

• There should be continuity between terminals A6 and C4, when 12 volt battery power is connected to terminal A3, and body ground is connected to terminal B1.
• There should be no continuity between terminals A6 and C4, and there should be continuity between terminals A6 and A7 when terminal B1 is disconnected.

Security horn relay circuit

• There should be battery voltage at terminal C12 when 12 volt battery power is connected to terminal C13, and body ground is connected to terminal C3.
• There should be no voltage at terminal C12 when terminal C3 is disconnected.

Security horn circuit diode

• There should be continuity between terminals A4 and A8.

Courtesy of HONDA, U.S.A., INC.

Ignition Coil Relay Circuit, PGM-FI Main Relay 1 Circuit, and PGM-FI Subrelay Circuit 

Ignition coil relay circuit

• There should be battery voltage at terminal B6 when 12 volt battery power is connected to terminal C9, and body ground is connected to terminal C5.
• There should be no voltage at terminal B6 when terminal C5 is disconnected.

PGM-FI main relay 1 circuit

• There should be battery voltage at terminal C17 when 12 volt battery power is connected to terminal C18, and body ground is connected to terminal C5.
• There should be no voltage at terminal C17 when terminal C5 is disconnected.

PGM-FI subrelay circuit

• There should be battery voltage at terminal B3 when 12 volt battery power is connected to terminal C14, and body ground is connected to terminal B2.
• There should be no voltage at terminal B3 when terminal B2 is disconnected.

Courtesy of HONDA, U.S.A., INC.