Montero V6-3.8L SOHC (2005)
CIRCUIT OPERATION
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The brake warning light power is supplied from the ignition switch (IG1). The M-ASTC-ECU grounds the circuit to illuminate the brake warning
light.
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The M-ASTC-ECU illuminates the brake warning light for 3 seconds while running its self-check. The brake warning light can be illuminated for
3 seconds upon start-up or with the ignition switch in the "ON" position, and the engine stopped.
TECHNICAL DESCRIPTION (COMMENT)
The cause is probably an open circuit at the brake warning light circuit, or malfunction of the M-ASTC-ECU.
TROUBLESHOOTING HINTS
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Damaged wiring harness or connector
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Blown fuse
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Malfunction of the combination meter
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Malfunction of the M-ASTC-ECU
DIAGNOSIS
Required Special Tool:
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MB991223: Harness Set
STEP 1. Check whether the brake warning light illuminates.
Q: Does the brake warning light illuminate at the condition that the ignition switch is turned to the "ON" position and the engine is stopped.
YES: Go to Step 2.
NO: Go to Step 5.
STEP 2. Check the brake warning light circuit at M-ASTC-ECU connector E-121.
