DTC B257A

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Diagnostic Instructions

  • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

  • Review Strategy Based Diagnosis for an overview of the diagnostic approach.

  • Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descr

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You may preview the service manual table of contents by clicking below.

Service Manual Table of Contents

Document Tags

Document Title: DTC B257A

diagnostic

instructions

system

procedure

headlamp

switch

signal

information

circuit

short

ground

open

voltage

park

position

control

module

receives

lamps

head

conditions

ignition

present

scan

tool

reference

connector

testing

connections

terminal

test

normal

replace

panel

dimmer

diagnostic procedure

circuit system

ground signal

signal headlamp

switch headlamps

headlamps signal

signal circuit

circuit headlamp

switch park

park lamps

headlamp switch input

switch headlamps signal

headlamps signal circuit

switch headlamp signal

headlamp signal circuit

signal circuit headlamp

circuit headlamp switch

headlamp switch park

switch park lamps

control module references

headlamp switch headlamps

circuit connections test

connections test normal

normal replace headlamp

panel dimmer switch