Mazda 626 Station Wagon, Workshop Manual

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TROUBLESHOOTING [POWER WINDOW SYSTEM]
NO. 1 FRONT DRIVER-SIDE WINDOW DOES NOT GO UP AND DOWN IN AUTOMATIC MODE.
1
Front driver-side window does not go up and down in automatic mode.
DESCRIPTION
Power window main switch may enter fail-safe mode.
PO S S IB LE
CAU SE
• Open or short to B+ circuit in limit switch signal, ground signal from wiring harness (between power
window main switch and driver-side front power window motor), inner control panel or inner motor:
Steps 3— 5
• Open or short to B+/ground circuit in pulse generator signal from wiring harness (between power
window main switch and driver-side front power window motor), inner control panel or inner motor:
Steps 6— 10
• Open or short to B+/ground circuit in +5 V signal from wiring harness (between power window main
switch and driver-side front power window motor), inner control panel or inner motor.
Diagnostic procedure
• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while
doing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If
there is a problem, check to make sure connectors, terminals and wiring harness are connected correctly and
undamaged.
STEP INSPECTION ACTION
1 CHECK TO SEE WHETHER POWER
WINDOW MAIN SWITCH ENTER FAIL-SAFE
MODE OR NOT
• Did driver-side front window go up or down
in automatic mode?
Yes Recheck malfunction symptoms.
No
Go to next step. (Power window main switch may enter
fail-safe mode.)
*2 CHECK TO SEE WHETHER PROBLEM IS
WITH LIMIT SWITCH SIGNAL OR GROUND
SIGNAL BETWEEN POWER WINDOW MAIN
SWITCH, IN DRIVER-SIDE FRONT POWER
WINDOW MOTOR, OR ELSEWHERE
• Test voltage at power window main switch
connector terminal 2B (limit switch signal).
• Is voltage approximately 5 V when driver-
side front window is closed completely and
0 V when it is opened halfway?
Yes Go to Step 6.
No Go to next step.
*3 CHECK TO SEE WHETHER MALFUNCTION
(LACK OF CONTINUITY OR SHORT TO B+)
IS IN DRIVER-SIDE FRONT POWER
WINDOW MOTOR OR ELSEWHERE
• Turn ignition switch to LOCK position.
• Disconnect driver-side front power window
motor.
• Turn ignition switch to ON position.
• Connect circuit tester negative probe to
driver-side front power window motor
connector terminal B, because it will be
possible to inspect the power window main
switch connector terminal 2C (ground
signal) line as well.
• Measure voltage at driver-side front power
window motor connector terminal F (limit
switch signal).
• Is voltage approximately 5 V?
Yes Replace driver-side front power window motor (open or
short to B+ in motor), then go to Step 15.
No Go to next step.
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