Relay Circuit Board: Test
- Relay Circuit Board - Test
The relay circuit board is part of the under-hood fuse/relay box, and it contains these relay circuits:
- PGM-FI main relay 1 circuit
- Electronic throttle control system (ETCS) control relay circuit
- Ignition coil relay circuit
- PGM-FI subrelay circuit
- Windshield wiper intermittent relay circuit
- Windshield wiper high/low relay circuit
- Taillight relay circuit
PGM-FI Main Relay 1 Circuit and Electronic Throttle Control System (ETCS) Control Relay Circuit Courtesy of HONDA, U.S.A., INC.HONDA, U.S.A., INC.HONDA, U.S.A., INC.HONDA, U.S.A., INC.HONDA, U.S.A., INC.
Ignition Coil Relay Circuit
PGM-FI Subrelay Circuit
Windshield Wiper Intermittent Relay Circuit and Windshield Wiper High/Low Relay Circuit
Taillight Relay Circuit
1. Test each relay circuit as shown: 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.
- Notice 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).
PGM-FI main relay 1 circuitThere should be battery voltage at terminals B10 (, B9, or B8) when 12 volt battery power is connected to terminal B4, and body ground is connected to terminal A9. There should be no voltage at terminals B10 (, B9, or B8) when terminal A9 is disconnected.
Electronic throttle control system (ETCS) control relay circuit
There should be continuity between terminals B2 and B3 when 12 volt battery power is connected to terminals B8 (, B9, or B10), and body ground is connected to terminal B1. There should be no continuity between terminals B2 and B3 when terminal B8 is disconnected.
Ignition coil relay circuit
There should be battery voltage at terminal A1 when 12 volt battery power is connected to terminal A10, and body ground is connected to terminal A9. There should be no voltage at terminal A1 when terminal A9 is disconnected.
PGM-FI subrelay circuit
There should be battery voltage at terminals A4 and A5 when 12 volt battery power is connected to terminal A2, and body ground is connected to terminal A6. There should be no voltage at terminals A4 and A5 when terminal A6 is disconnected.
Windshield wiper intermittent relay circuit
There should be continuity between terminals B12 and B14 when 12 volt battery power is connected to terminal B7, and body ground is connected to terminal B16. There should be no continuity between terminals B12 and B14 when terminal B16 is disconnected.
Windshield wiper high/low relay circuit
There should be continuity between terminals B5 and B15 when 12 volt battery power is connected to terminal B7, and body ground is connected to terminal B6. There should be no continuity between terminals B5 and B15 when terminal B6 is disconnected.
Taillight relay circuit
There should be battery voltage at terminal A3 when 12 volt battery power is connected to terminal A7, and body ground is connected to terminal A8. There should be no voltage at terminal A3 when terminal A8 is disconnected.2. If any of these relay circuit fails the test, replace the relay circuit board.