#PIC4957E - High Speed LAN Diagnostics/Remembering Ohms Law - (Apr 21, 2011)

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Subject:
HIGH SPEED LAN Diagnostics/Remembering Ohms Law
Models:
2004-2009 All Cars

This PI was superseded to make correction on Step #5. Please discard PIC4957D.


The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Conce...

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Document Title: #PIC4957E - High Speed LAN Diagnostics/Remembering Ohms Law - (Apr 21, 2011)

high

speed

ohms

following

vehicle

serial

data

circuit

short

gmlan

shorted

ground

voltage

module

open

control

disconnected

with

terminating

communicating

that

disconnect

connector

ignition

seconds

test

terminal

greater

specified

range

resistance

testing

between

harness

easily

accessible

just

verify

replace

direction

repeat

conditions

isolated

resistor

pair

together

data circuit

speed gmlan

gmlan serial

short voltage

control module

control modules

module communicating

open resistance

ignition test

test serial

terminal terminal

testing serial

circuits short

test greater

between serial

short ground

test ohms

ignition disconnect

disconnect harness

connectors high

circuits easily

accessible control

circuit control

module connector

disconnected ground

ground verify

circuits greater

circuits specified

range replace

replace control

circuits control

module just

module terminating

terminating resistor

resistor testing

connectors speed

module direction

between pair

pair serial

connector disconnected

disconnected verify

circuits shorted

shorted together

serial data circuit

speed gmlan serial

gmlan serial data

specified range test

test serial data

circuits listed ground

listed ground terminal

ground terminal terminal

testing serial data

seconds test greater

between serial data

data circuits open

data circuits short

ignition disconnect harness

disconnect harness connectors

harness connectors high

data circuits easily

circuits easily accessible

easily accessible control

ignition test greater

test greater serial

data circuit control

circuit control module

control module connector

module connector just

disconnected ground verify

data circuits specified

range replace control

replace control module

control module disconnected

data circuits control

circuits control module

control module just

short voltage serial

voltage serial data

circuit control modules

control module terminating

module terminating resistor

terminating resistor testing

resistor testing serial

that disconnected ground

data circuits greater

harness connectors speed

connectors speed gmlan

control module direction

short ground serial

ground serial data

seconds test ohms

between pair serial

pair serial data

connector disconnected verify

data circuits ohms

specified range replace

connect harness connectors

harness connectors control

connectors control module

circuits shorted together

data circuits shorted

shorted together control

open resistance serial

resistance serial data