Suzuki Grand Vitara XL-7 Service Manual page 538

Step
7 Check 4WD controller.
1) Turn ignition switch ON.
2) Check voltage between terminal E23-3 and
ground.
Transfer lever is in "N" or "2H": 0 – 1 V
Transfer lever is in "4L" or "4H": 10 – 14 V
(1 second after transfer lever is shifted to "4H" or
"4L".)
8 Check 4WD controller.
1) Check for proper connection to air pump
assembly at all terminals.
2) Turn ignition switch ON.
3) Check voltage between terminal E23-7 and
ground.
Transfer lever is in "N" or "2H": 0 – 1 V
Transfer lever is in "4L" or "4H": 10 – 14 V
(4 seconds after transfer lever is shifted to "4H"
or "4L".)
9 Check 4WD indicator lamp circuit.
1) Turn ignition switch ON.
2) Check voltage between terminal E23-1 and
ground.
Transfer lever is in "N" or "2H": 10 – 14 V
Transfer lever is in "4L" or "4H": 0 – 1 V
(4 seconds after transfer lever is shifted to "4H"
or "4L".)
Action Yes
Go to Step 8.
Go to Step 9.
Substitute a known-
good 4WD controller
and recheck.
DIFFERENTIAL (FRONT) 7E-7
No
Substitute a known-
good 4WD controller
and recheck.
Substitute a known-
good 4WD controller
and recheck.
Check "ORN/BLK"
circuit (Including
indicator lamp and
combination meter).
If OK, substitute a
known-good 4WD
controller and recheck.