Bulb Check Diagnostic Circuits False Alarm:Loose GND (MAZ0169AP)

Publication date: 1970-01-01
Reference number: MAZ0169AP

BULB CHECK DIAGNOSTIC CIRCUITS FALSE ALARM:LOOSE GND

TECHNICAL INFORMATION TIP

Reference Number(s): MAZ0169AP, Date of Issue:

BULB CHECK FALSE ALARMS

YEAR(S): 1987

MANUFACTURER: Mazda

MODEL(S): 626

ISSUE & TIP

Some 1987 Mazda 626 models with bulb check diagnostic circuits may indicate a problem with a tail or stop light bulb. After checking the rear lights, you will probably find that all of the bulbs are okay.

The actual cause of the problem is a loose ground connection for the tail light housing. This increases the circuit resistance, fooling the bulb check circuit into thinking that a bulb has burned out, and turning on the dash warning light. In spite of the dash warning, the tail and stop light bulbs will continue to function normally. Repair the poor ground to correct the false alarm.

Courtesy of Import Service Magazine

with thanks to:

Richard Jennings

Franklin Institute

Boston, Massachusetts

REFERENCE NUMBER

MAZ0169AP

NOTE: This information has been obtained from sources generally believed to be reliable. Use your own judgment before relying on this data. Neither the suppliers of these Technical Information Tips, nor lemon-25 Repair Information Company, LLC, guarantees or assumes responsibility for data accuracy or completeness, nor is liability assumed by the suppliers of these Technical Information Tips or lemon-25 Repair Information Company, LLC, for any claims or damages resulting from the use of this information.