Mazda 6 2002 - No.2 Neither Abs Warning Light nor Brake System Warning Lightilluminate with Ignition Switch on

P108
TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL)
NO.2 NEITHER ABS WARNING LIGHT NOR BRAKE SYSTEM WARNING LIGHT ILLUMINATE WITH
IGNITION SWITCH ON
A6E699067650W06
• 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
2
Neither ABS warning light nor BRAKE system warning light illuminate with ignition switch
on.
[TROUBLESHOOTING HINTS]
• Malfunction of instrument cluster or ABS/TCS HU/CM
• Improper configuration (instrument cluster)
STEP INSPECTION ACTION
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?
Yes Replace instrument cluster (open circuit in instrument
cluster).
No Go to next step.
2 INSPECT INSTRUMENT CLUSTER POWER
SUPPLY FUSE
• Is instrument cluster ignition power supply
fuse okay?
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.
*
3
VERIFY WHETHER MALFUNCTION IS IN
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?
Yes Replace instrument cluster (open circuit in instrument
cluster).
No Check for open circuit between instrment cluster and
ground.
Repair or replace as neccessary.
4 COMFIRM DTC U1900 USING WDS OR
EQUIVALENT
• Retrieve DTC from PCM, ABS/TCS and
instrument cluster.
• Is DTC U1900 retrieved?
Yes Go to next step.
No Inspect instrment cluster. If OK, then go to step6.
5 COMFIRM THE FOLLOWING PIDs USING
WDS OR EQUIVALENT:
• ABS_MSG
• PCM_MSG
• Is not present massage displayed on WDS
or equivalent?
Yes Replace instrument cluster (open circuit in instrument
cluster).
No Network communication, for related system is malfunction.
Repair or replace as neccessary.
6 COMFIRM DTC B2477 FOR INSTRUMENT
CLUSTER USING WDS OR EQUIVALENT
• Is DTC B2477 retrieved?
Yes
Re
-configure the
instrument cluster.
No Replace ABS/TCS HU/CM.