Montero V6-3.8L SOHC (2005)
Column Switch Power Supply And SWS Communication Circuit Part 2
CIRCUIT OPERATION
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The power supply to the column switch is provided by the battery and the ignition switch (IG1).
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If the power supply system from the battery is defective, the system operates by the power supply from the ignition switch (IG1).
TECHNICAL DESCRIPTION (COMMENT)
The power supply circuit to the column switch (column-ECU) may be defective. If the battery power supply circuit (terminal 1 of the column switch) to
the ECU is damaged, also check the power supply circuit from the ignition switch (IG1) (terminal 9 of the column switch), and repair if necessary.
TROUBLESHOOTING HINTS
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The ETACS-ECU may be defective
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The column switch may be defective
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The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
DIAGNOSIS
Required Special Tools:
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MB991223: Harness Set
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MB991958: Scan Tool (MUT-III Sub Assembly)
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MB991824: Vehicle Communication Interface (V.C.I.)
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MB991827: MUT-III USB Cable
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MB991911: MUT-III Main Harness B
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MB991813: SWS Monitor Kit
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MB991806: SWS Monitor Cartridge
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MB991812: SWS Monitor Harness (For Column-ECU)
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MB991822: Probe Harness
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MB991854: SWS Monitor Harness (For 13-pin)
STEP 1. Use scan tool MB991958 to select "ECU COMM CHK" on the SWS monitor display.
Check the following ECUs:
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ETACS-ECU
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Column-ECU
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or
disconnecting scan tool MB991958.
