DETERMINING MALFUNCTIONING PART (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D.)]

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Caution

• If the malfunctioning part is detected in the communication line, before disconnecting the related connector for inspection, press the connector in the connection direction to verify that there is no looseness or disconnection.

• When disconnecting the connector, verify that there is no damage, deformation, or corrosion of the connector terminals.

1. Verify the CAN system-related module DTCs and the failed module on the M-MDS screen.

2. Refer to “DTC Output Pattern and Malfunctioning Part” and find the area linked from the malfunctioning part.

Note

• A hyphen (-) in the DTC output pattern cell indicates that the DTC may be displayed depending on the malfunction detection conditions. If it is not displayed, the malfunctioning part can be determined by checking only the crosses (×).

• If any of the following DTCs is displayed alone, perform the applicable DTC inspection. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM (L.H.D.)].)

― ABS HU/CM: U2023

― DSC HU/CM: U2023

― Instrument cluster: U2023

3. Inspect the possible cause and inspection item of the applicable malfunctioning part.

4. Perform the DTC inspection after the repair procedure.

• If any DTC is displayed, return to FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (L.H.D.)].

DTC Output Pattern and Malfunctioning Part

Cross (×): Displayed

Hyphen (-): May or may not be displayed

M-MDS display		DTC output pattern and malfunctioning part
DTC output module	DTC	A	B	C	D	E	F	G	H	I	J	K	L	M
PCM (PCM)	U0101		×
	U0121				×	×
	U0155													×
TCM^*1 (TCM)	U0100	×
ABS^*2 (ABS HU/CM)	U2023	-		-
ABS^*3 (DSC HU/CM)	U0100	×		×
	U0101		×	×
	U0155													×
	U2023	-		-
RHT^*4 (Power retractable hardtop control module)	U0100	×		×			×
	U0101		×	×			×
	U2197	-		-			-
DHS^*5 (Active bonnet control module)	U0155:00													×
IC (Instrument cluster)	U0100	×		×			×		×		×		×
	U0101		×	×			×		×		×		×
	U0121				×	×	×		×		×		×
	U0207							×	×		×		×
	U0214											×	×
	U0250									×	×		×
	U2023	-		-			-		-		-		-
	U2197	-		-			-		-		-		-
M-MDS display module		“Fail” display pattern
PCM		×		×			×		×		×		×
TCM^*1			×	×			×		×		×		×
ABS^{2, 3}					×	×	×		×		×		×
RHT^*4								×	×		×		×
DHS^*5										×	×		×
IC														×

*1 :AT

*2 :Vehicles with ABS

*3 :Vehicles with DSC

*4 :Vehicles with power retractable hardtop system

*5 :Vehicles with active bonnet

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between PCM and branch A

• PCM malfunction

System wiring diagram

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Inspection item

• PCM connector

• Wiring harness between PCM terminal 1AM and branch A

• Wiring harness between PCM terminal 1AI and branch A

• PCM

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between TCM and branch A

• TCM malfunction

System wiring diagram

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Inspection item

• TCM connector

• Wiring harness between TCM terminal 1G and branch A

• Wiring harness between TCM terminal 1C and branch A

• TCM

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between branch A and branch B

System wiring diagram

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Inspection item

• Wiring harness between branch A and branch B

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between ABS HU/CM and branch B

• ABS HU/CM malfunction

System wiring diagram

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Inspection item

• ABS HU/CM connector

• Wiring harness between ABS HU/CM terminal Z and branch B

• Wiring harness between ABS HU/CM terminal Y and branch B

• ABS HU/CM

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between DSC HU/CM and branch B

• DSC HU/CM malfunction

System wiring diagram

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Inspection item

• DSC HU/CM connector

• Wiring harness between DSC HU/CM terminal X and branch B

• Wiring harness between DSC HU/CM terminal W and branch B

• DSC HU/CM

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring branch B and connector C-08

• Open circuit in wiring connector C-08 and branch C

• Connector C-08 malfunction

System wiring diagram

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Inspection item

• Connector C-08

• Wiring harness between branch B and connector C-08

• Wiring harness between connector C-08 and branch C

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring power retractable hardtop control module and branch C

• Power retractable hardtop control module malfunction

System wiring diagram

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Inspection item

• Power retractable hardtop control module connector

• Wiring harness between power retractable hardtop control module terminal 1S and branch C

• Wiring harness between power retractable hardtop control module terminal 1U and branch C

• Power retractable hardtop control module

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between branch C and connector C-08

• Open circuit in wiring harness between connector C-08 and connector C-05

• Open circuit in wiring harness between connector C-05 and branch D

• Connector C-08 malfunction

• Connector C-05 malfunction

System wiring diagram

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Inspection item

• Connector C-08

• Connector C-05

• Wiring harness between branch C and connector C-08

• Wiring harness between connector C-08 and connector C-05

• Wiring harness between connector C-05 and branch D

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between active bonnet control module and branch D

• Active bonnet control module malfunction

System wiring diagram

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Inspection item

• Active bonnet control module connector

• Wiring harness between active bonnet control module terminal 2M and branch D

• Wiring harness between active bonnet control module terminal 2O and branch D

• Active bonnet control module

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between branch D and branch E

System wiring diagram

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Inspection item

• Wiring harness between branch D and branch E

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between keyless control module and branch E

• Keyless control module malfunction

System wiring diagram

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Inspection item

• Keyless control module connector

• Wiring harness between keyless control module terminal 4AA and branch E

• Wiring harness between keyless control module terminal 4Z and branch E

• Keyless control module

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between branch E and connector C-11

• Open circuit in wiring harness between connector C-11 and branch F

• Connector C-11 malfunction

System wiring diagram

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Inspection item

• Connector C-11

• Wiring harness between branch E and connector C-11

• Wiring harness between connector C-11 and branch F

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between instrument cluster and branch F

• Instrument cluster malfunction

System wiring diagram

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Inspection item

• Instrument cluster connector

• Wiring harness between instrument cluster terminal 1J and branch F

• Wiring harness between instrument cluster terminal 1L and branch F

• Instrument cluster