No.1 Abs Warning Light, Brake System Warning Light, Tcs Off Light Do Not Illuminate With Ignition Switch On - Mazda 2002 6 Workshop Manual

TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL)
NO.1 ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, TCS OFF LIGHT DO NOT ILLUMINATE
WITH IGNITION SWITCH ON
Vehicle with ABS/TCS
ABS warning light, BRAKE system warning light, TCS OFF light do not illuminate with ignition switch
1
on.
[TROUBLESHOOTING HINTS]
• Malfunction of instrument cluster or ABS/TCS HU/CM
• Improper configuration (instrument cluster)
STEP
1 VERIFY WHETHER MALFUNCTION IS IN
WARNING LIGHTS AND INDICATOR LIGHTS'
COMMON POWER SUPPLY, OR IN OTHER
WARNING LIGHTS AND INDICATOR LIGHTS
• Do other warning and indicator lights
illuminate when IG switch is turned ON?
2 INSPECT INSTRUMENT CLUSTER POWER
SUPPLY FUSE
• Is instrument cluster ignition power supply
fuse okay?
* VERIFY WHETHER MALFUNCTION IS IN
3
WIRING HARNESS (BETWEEN INSTRUMENT
CLUSTER POWER SUPPLY AND
INSTRUMENT CLUSTER FOR CONTINUITY)
OR INSTRUMENT CLUSTER
• Turn ignition switch ON.
• Measure voltage at instrument cluster
connector (24-pin ) terminal 2V.
• Is voltage approximately 12V?
4 COMFIRM DTC U1900 USING WDS OR
EQUIVALENT
• Retrieve DTC from PCM, ABS/TCS and
instrument cluster.
• Is DTC U1900 retrieved?
5 COMFIRM THE FOLLOWING PIDs USING
WDS OR EQUIVALENT:
• ABS_MSG
• PCM_MSG
• Is "not present" massage displayed on WDS
or equivalent?
6 COMFIRM DTC B2477 FOR INSTRUMENT
CLUSTER USING WDS OR EQUIVALENT
• Is DTC B2477 retrieved?
• 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 malfunction. If
there is a problem, check to make sure connectors, terminals and wiring harnesses are connected correctly
and undamaged.
End Of Sie
INSPECTION
Yes Replace instrument cluster (open circuit in instrument
cluster).
No Go to next step.
Yes Go to next step.
No Check for a short to ground on blown fuse's circuit.
Repair or replace as necessary.
Install appropriate amperage fuse.
Yes Replace instrument cluster (open circuit in instrument
cluster).
No Check for open circuit between instrment cluster and
ground.
Repair or replace as neccessary.
Yes Go to next step.
No Inspect instrment cluster. If OK, then go to step6.
Yes Replace instrument cluster (open circuit in instrument
cluster).
No Network communication, for related system is malfunction.
Repair or replace as neccessary.
Yes Re -configure the
instrument cluster.
No Replace ABS/TCS HU/CM.
A6E699067650W05
ACTION
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