Power and Ground Distribution: Testing and Inspection

Power Relay Test

Special Tools Required
- Relay Puller 07AAC-000A1A0

Use this chart to identify the type of relay, then do the test listed for it.





*: Carefully remove the relay from the driver's under-dash fuse/relay box using the relay puller. Do not use pliers. Pliers will damage the relay.






Normally-open type

Check for continuity between the terminals:

- There should be continuity between the terminals No. 1 and No. 2 when battery power is connected to the terminal No. 4, and battery ground is connected to the terminal No. 3.

- There should be no continuity between the terminals No. 1 and No. 2 when power is disconnected.









Five-terminal type

Check for continuity between the terminals:

- There should be continuity between the terminals No. 1 and No. 2 when battery power is connected to the terminal No. 5, and battery ground is connected to the terminal No. 3.

- There should be continuity between the terminals No. 1 and No. 4 when power is disconnected.

Diode type









Relay Circuit Board Test

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

- A/C condenser fan relay

- Radiator fan relay

- Fan control relay

- Wiper motor relay

- Wiper intermittent relay

- Wiper high/low relay









1. Disconnect the negative battery cable, then disconnect under-hood fuse/relay box connectors B (14P) and C (5P).
A/C condenser fan relay circuit test

There should be continuity between the terminals B1 and C4 when battery power is connected to the terminal B3, and battery ground is connected to the terminal B8.

There should be no continuity between the terminals B1 and C4 when power is disconnected.

Radiator fan relay circuit test

There should be continuity between the terminals C1 and B2 when battery power is connected to the terminal B7, and battery ground is connected to the terminal B11.

There should be no continuity between the terminals C1 and B2 when power is disconnected.

Fan control relay circuit test

There should be continuity between the terminals C3 and C5 when battery power is connected to the terminal B3, and battery ground is connected to the terminal B11.

There should be continuity between the terminals C3 and B2 when power is disconnected.

Wiper motor relay circuit test

There should be continuity between the terminals C2 and B6, when battery power is connected to the terminals B12 and C2, and battery ground is connected to the terminals B4 and B13.

There should be no continuity between the terminals C2 and B6, when the ground is disconnected from the terminal B4.

Wiper intermittent relay circuit test

There should be battery voltage between the terminal B6 and body ground when battery power is connected to the terminals B12 and C2, and battery ground is connected to the terminals B4 and B13.

There should be no voltage between the terminal B6 and body ground when the terminal B13 is disconnected.

Wiper high/low relay circuit test

There should be continuity between the terminals B4 and B5 when battery power is connected to the terminals B12 and C2, and battery ground is connected to the terminals B4 and B14.

There should be no continuity between the terminals B4 and B5, and there should be continuity between the terminals B4 and B6 when power is disconnected.

2. If the relay circuit test is not as specified, replace the relay circuit board.