Under-Dash Subrelay Box Removal, Installation, and Test
3. Under-Dash Subrelay Box - Remove
1.
Disconnect the connectors.
2.
Remove the under-dash subrelay box (A).

4. All Removed Parts - Install
1.
Install the parts in the reverse order of removal.

1. Under-Dash Subrelay Box - Test
The under-dash subrelay box is contains these relays:
ACC relay circuit
IG1A relay circuit
IG1B relay circuit
IG2 relay circuit
1.
Test each relay circuit as shown:

ACC relay circuit, IG1A relay circuit, IG1B relay circuit, and IG2 relay circuit

ACC relay circuit

There should be continuity between terminals A2 and C1, when 12 volt battery power is connected to terminal B2, and body ground is connected to terminal B1. There should be no continuity between terminals A2 and C1 when power is disconnected.

IG1A relay circuit

There should be continuity between terminals A1 and C3 (or B7), when 12 volt battery power is connected to terminal B3, and body ground is connected to terminal B1. There should be no continuity between terminals A1 and C3 (or B7) when power is disconnected.

IG1B relay circuit

There should be continuity between terminals A2 and C2 (or B6), when 12 volt battery power is connected to terminal B3, and body ground is connected to terminal B1. There should be no continuity between terminals A2 and C2 (or B6) when power is disconnected.

IG2 relay circuit

There should be continuity between terminals A1 and C4 (or B5), when 12 volt battery power is connected to terminal B4, and body ground is connected to terminal B1. There should be no continuity between terminals A1 and C4 (or B5) when power is disconnected.
2.
If any of these relay circuit fails the test, replace the under-dash subrelay box.