DTC B3948 or B3949

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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 B3948 or B3949

diagnostic

instructions

system

dtcb

left

signal

circuit

short

battery

ground

open

right

information

resistance

voltage

fuse

control

front

rearview

mirror

driver

passenger

lamp

description

switch

ignition

module

instrument

cluster

indicator

conditions

detects

inoperative

testing

bulb

socket

test

terminal

reference

exterior

connector

component

scan

tool

disconnect

harness

kbody

verify

terminal

illuminate

xafuse

block

panel

greater

repair

infinite

replace

connect

appropriate

listed

elfturn

chevrolet

elaheadlamp

assembly

buick

aaoutside

turns

erfturn

eraheadlamp

aboutside

replacement

short ground

right signal

open resistance

short voltage

signal control

signal lamp

signal lamps

control module

signal indicator

detects open

control circuit

ground circuit

detects short

test lamp

harness connector

connector kbody

kbody control

module ignition

verify test

lamp illuminates

lamp illuminate

illuminate circuit

circuit fuse

ignition disconnect

connector xafuse

instrument panel

repair open

resistance circuit

fuse open

test infinite

infinite resistance

circuit ground

resistance repair

repair short

replace kbody

module test

elfturn signal

aaoutside rearview

circuit terminal

terminal listed

listed ground

socket terminal

terminal chevrolet

terminal buick

driver terminal

lamp turns

lamp ignition

signal bulb

erfturn signal

eraheadlamp assembly

aboutside rearview

passenger terminal

circuit short ground

signal circuit open

right signal circuit

outside rearview mirror

rearview mirror ground

signal lamp ground

signal multifunction switch

detects open resistance

open resistance signal

signal control circuit

signal ground circuit

detects short ground

short ground open

ground open resistance

fuse circuit dtcbthe

open resistance right

resistance right signal

right signal control

signal indicator instrument

indicator instrument cluster

instrument cluster flashes

cluster flashes rapidly

control module references

harness connector kbody

connector kbody control

kbody control module

control module ignition

verify test lamp

test lamp illuminates

lamp illuminates circuit

illuminates circuit terminal

circuit terminal ground

terminal ground test

ground test lamp

test lamp illuminate

lamp illuminate circuit

illuminate circuit fuse

circuit fuse ignition

fuse ignition disconnect

ignition disconnect harness

disconnect harness connector

harness connector xafuse

connector xafuse block

greater repair open

repair open resistance

open resistance circuit

verify fuse open

fuse open voltage

open voltage fuse

voltage fuse test

fuse test lamp

circuit fuse open

fuse open ignition

open ignition disconnect

test infinite resistance

infinite resistance circuit

resistance circuit ground

circuit ground infinite

ground infinite resistance

infinite resistance repair

resistance repair short

repair short ground

short ground circuit

infinite resistance replace

resistance replace kbody

replace kbody control

control module test

module test lamp

lamp illuminates ignition

illuminates ignition connect

ignition exterior lamps

exterior lamps disconnect

lamps disconnect harness

harness connector appropriate

connector appropriate component

appropriate component listed

elfturn signal lamp

aaoutside rearview mirror

appropriate ground circuit

ground circuit terminal

circuit terminal listed

terminal listed ground

socket terminal chevrolet

driver terminal buick

open resistance ground

resistance ground connection

connect test lamp

test lamp appropriate

lamp appropriate control

appropriate control circuit

control circuit terminal

listed ground ignition

terminal buick verify

buick verify test

test lamp turns

lamp turns commanding

signal lamp scan

lamp scan tool

scan tool test

tool test lamp

test lamp ignition

lamp ignition disconnect

infinite resistance control

resistance control circuit

control circuit ground

circuit terminal ground

greater repair short

repair short voltage

short voltage circuit

lamp turns test

turns test replace

test replace inoperative

replace inoperative signal

inoperative signal bulb

erfturn signal lamp

aboutside rearview mirror

right socket terminal

right terminal buick

passenger terminal buick

signal bulb replacement