Mariner 4WD L4-2.5L (2010)
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Start the engine.
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With the headlights on high beam and the heater blower fan on high, measure the voltage drop between DC/DC converter C1457C, positive post
and 12-volt battery C1100A, positive post.
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Is the voltage drop less than 0.75 volt?
Yes
GO to D10.
No
REPAIR or INSTALL a new 12-volt battery cable assembly as necessary. REFER to Battery. TEST the system for normal operation.
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D10 CHECK THE NEGATIVE 12-VOLT CABLE VOLTAGE DROP
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With the engine still running, and with the headlights on high beam and the heater blower fan on high, measure the voltage drop between DC/DC
converter C1457B, negative post and DC/DC converter ground G105, ground bolt side.
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Is the voltage drop less than 0.25 volt?
Yes
GO to D11.
No
REPAIR or INSTALL a new 12-volt battery cable assembly as necessary. REFER to Battery. TEST the system for normal operation.
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D11 CHECK FOR AN OPEN IN THE DC/DC CONVERTER WIRING HARNESS
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Turn off the headlights and heater blower fan.
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Ignition OFF.
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Depower the HVTB system. Refer to the general procedure in Hybrid Drive Systems.
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Disconnect: DC/DC Converter C1457D.
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Disconnect: TCM C1458E.
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Measure the resistance between DC/DC converter C1457D-(+), circuit HYT03 (OG), harness side, and TCM C1458E-(+), circuit HYT03 (OG),
harness side.
