Wire Damage Inspection

Turn ignition switch to ON position.
Turn on defogger switch.
Measure voltage at each position(s) as follows.
For wagon model:

Measure voltage at the center of each defogger wire (1), and check defogger wire condition according to the following table.

For sedan model:

Measure voltage at position "a" and position "b" of each defogger wire (1), and check defogger wire condition according to the following table.

If defogger wire open is found, go to next step.

Fig 1: Defogger Wire Voltage Table (Wagon)
Courtesy of SUZUKI OF AMERICA CORP.

Fig 2: Defogger Wire Voltage Table (Sedan)
Courtesy of SUZUKI OF AMERICA CORP.

Fig 3: Checking Defogger Wire
Courtesy of SUZUKI OF AMERICA CORP.
Touch voltmeter negative (-) lead to defogger wire ground terminal end (1).
Touch voltmeter positive (+) lead with a foil strip to defogger wire power source terminal end (2), then move it along wire to defogger wire ground terminal end (1).
For wagon model:

The place where voltmeter fluctuates from 10 - 12 V to 0 - 1 V is where there is open.

For sedan model:

The place where voltmeter fluctuates from 10 - 12 V to 4 - 6 V or 4 - 6 V to 0 - 1 V is where there is open.

If found defective, repair defogger wire referring to REAREND DOOR WINDOW / BACK WINDOW DEFOGGER WIRE REPAIR .

Fig 4: Checking Defogger Wire
Courtesy of SUZUKI OF AMERICA CORP.