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Home >> Mazda >> 2013 >> 5 Grand Touring >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> On-Board Diagnostic [Multiplex Communication System] >> Determining Short To Ground Location (Ms-Can) [Multiplex Communication System] >> Determination Procedure

Determination Procedure

CAUTION:
  • When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.
  • When inspecting the DLC-2, touch it with a paper clip or similar thin pin without directly inserting a tester into the terminals.
Step Inspection Action
1 INSPECT CAN-RELATED MODULES FOR SHORT TO GROUND 
  • Disconnect the negative battery cable.
  • Remove the instrument cluster, climate control unit, audio unit, SIRIUS satellite radio unit, Bluetooth unit, and information display one by one and verify the continuity between the following terminals:
    • Between DLC-2 terminal L and body ground
    • Between DLC-2 terminal K and body ground
  • Is there continuity?
Yes Go to the next step.
No Replace the module in which there was no continuity when it was removed.
2 INSPECT CAN LINE BETWEEN CONNECTOR C-45 AND DLC-2 FOR SHORT TO GROUND 
  • Disconnect connector C-45.
  • Verify continuity between the following terminals:
    • Between DLC-2 terminal L and body ground
    • Between DLC-2 terminal K and body ground
  • Is there continuity?
Yes Repair or replace the wiring harness between DLC-2 and connector C-45 because the wiring harness is shorted to ground.
No Go to the next step.
3 INSPECT CAN LINE BETWEEN INSTRUMENT CLUSTER AND CONNECTOR C-45 FOR SHORT TO GROUND 
  • Verify continuity between the following terminals:
    • Between instrument cluster terminal C (wiring harness side) and body ground
    • Between instrument cluster terminal E (wiring harness side) and body ground
  • Is there continuity?
Yes Repair or replace the wiring harness between the instrument cluster and connector C-45 because the wiring harness is shorted to ground.
No Go to the next step.
4 INSPECT CAN LINE BETWEEN CLIMATE CONTROL UNIT AND CONNECTOR C-45 FOR SHORT TO GROUND 
  • Verify continuity between the following terminals:
    • Between climate control unit terminal 1W (wiring harness side) and body ground
    • Between climate control unit terminal 1X (wiring harness side) and body ground
  • Is there continuity?
Yes Repair or replace the wiring harness between the climate control unit and connector C-45 because the wiring harness is shorted to ground.
No Go to the next step.
5 INSPECT CAN LINE BETWEEN AUDIO UNIT AND CONNECTOR C-45 FOR SHORT TO GROUND 
  • Verify continuity between the following terminals:
    • Between audio unit terminal 1O (wiring harness side) and body ground
    • Between audio unit terminal 1Q (wiring harness side) and body ground
  • Is there continuity?
Yes Repair or replace the wiring harness between the audio unit and connector C-45 because the wiring harness is shorted to ground.
No Go to the next step.
6 INSPECT CAN LINE BETWEEN SIRIUS SATELLITE RADIO UNIT AND CONNECTOR C-45 FOR SHORT TO GROUND 
  • Verify continuity between the following terminals:
    • Between SIRIUS satellite radio unit terminal L (wiring harness side) and body ground
    • Between SIRIUS satellite radio unit terminal K (wiring harness side) and body ground
  • Is there continuity?
Yes Repair or replace the wiring harness between the SIRIUS satellite radio unit and connector C-45 because the wiring harness is shorted to ground.
No Go to the next step.
7 INSPECT CAN LINE BETWEEN INFORMATION DISPLAY AND CONNECTOR C-45 FOR SHORT TO GROUND 
  • Verify continuity between the following terminals:
    • Between information display terminal J (wiring harness side) and body ground
    • Between information display terminal L (wiring harness side) and body ground
  • Is there continuity?
Yes Repair or replace the wiring harness between the information display and connector C-45 because the wiring harness is shorted to ground.
No Repair or replace the wiring harness between the Bluetooth unit and connector C-45 because the wiring harness is shorted to ground.