Mazda 6 2002 - Switch on; Brake System Warning Light

P118
TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL)
Diagnostic procedure
End Of Si e
STEP INSPECTION ACTION
1 CHECK FOR DTCS IN DSC HU/CM
• Check the DTC for the DSC ON-BOARD
DIAGNOSTIC SYSTEM.
• Have DTCs been recorded in memory?
Yes Perform inspection using appropriate DTC.
No Go to next step.
2 CHECK TO SEE WHETHER MALFUNCTION
IS IN INSTRUMENT CLUSTER SYSTEM OR
OTHER SYSTEM
• Do other warning and indicator lights
illuminate when IG switch is turned ON?
Yes Go to next step.
No Inspect or repair instrument cluster (power supply system,
ground system).
3 VERIFY THAT DSC HU/CM CONNECTOR IS
CONNECTED
• Is DSC HU/CM securely connected?
Yes Go to next step.
No Connect DSC HU/CM connector securely, then go to next
step.
4 VERIFY THAT DSC HU/CM CONNECTOR
TERMINAL OR RELATED CONNECTOR
TERMINALS ARE CONNECTED
• Are DSC HU/CM connector terminal, or
instrument cluster connector terminal, or
related connector terminals securely
connected?
Yes Go to next step.
No Connect DSC HU/CM connector terminal etc. related
connector terminal securely.
5 CHECK TO SEE WHETHER MALUNCTION IS
IN DSC INDICATOR LIGHT AND TCS OFF
LIGHT OR ABS WARNING LIGHT AND
BRAKE SYSTEM WARNING LIGHT
• If DSC indicator light and TCS OFF light do
not illuminate, go to Step 6.
• If ABS warning light and BRAKE system
warning light do not illuminate, go to Step 8.
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6 CHECK TO SEE WHETHER MALFUNCTION
IS IN DSC HU/CM OR OTHER
• Disconnect DSC HU/CM.
• Connect the DSC indicator light terminal and
DSC OFF light terminal to body ground.
• Do both indicator lights illuminate with
ignition switch on?
Yes Replace DSC HU/CM (open in DSC HU/CM).
No Go to next step.
7 INSPECT WIRING HARNESS BETWEEN
INSTRUMENT CLUSTER AND DSC HU/CM
FOR CONTINUITY
• Is there continuity between each indicator
light terminals of instrument cluster and DSC
HU/CM connector terminal?
Yes Inspect or repair indicator light circuit in instrument cluster.
No Repair malfunctioning part.
8 CHECK TO SEE WHETHER MALFUNCTION
IS IN DSC HU/CM OR OTHER
• Disconnect DSC HU/CM and turn ignition
switch on.
• Do ABS warning light and BRAKE system
warning lights illuminate with ignition switch
on?
(If above lights illuminate, both lights circuits
are normal.)
Yes Replace DSC HU/CM (short in DSC HU/CM).
No Go to next step.
9 INSPECT WIRING HARNESS BETWEEN
INSTRUMENT CLUSTER AND DSC HU/CM
FOR SHORT
• Is there continuity between each warning
light terminal of DSC HU/CM and ground?
Yes Repair malfunctioning part.
No Inspect or repair warning light circuit in instrument cluster.