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Ground Circuits
- Turn ignition switch to the "OFF" position. Connect ohmmeter across ground and terminals No. 10, 20, 32 and 34 of ECU connector. Resistance should be zero in all cases.
- If resistance is not correct, check wiring harness to and from ECU for damage and correct connections. Circuits No. 10, 20 and 34 are grounded at right side taillight. If a fault is found at terminal No. 32, test with a new solenoid valve relay.