1.CHECK VDCCM&H/U INPUT VOLTAGE. 1) Turn the ignition switch to OFF. 2) Disconnect the connector from the VDCCM&H/U. 3) Turn the ignition switch to ON. 4) Measure the voltage between VDCCM&H/U connector and chassis ground. Connector & terminal (B310) No. 5 (+) — Chassis ground (−): (B310) No. 33 (+) — Chassis ground (−): | Is the voltage 10 — 15 V- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1521 MOTOR RELAY | Repair the VDCCM&H/U power supply circuit. |
2.CHECK VDCCM&H/U INPUT VOLTAGE. Calculate the voltage difference measured in step 1. A: (B310) No. 5 (+) — Chassis ground (−): B: (B310) No. 33 (+) — Chassis ground (−): | Is the voltage difference between A and B 2 V or more- | Repair the power supply circuit. | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1521 MOTOR RELAY |
3.CHECK INSTALLATION OF VDCCM&H/U GROUND. | Is the VDCCM&H/U ground terminal installation bolt installed correctly- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1521 MOTOR RELAY | Install the VDCCM&H/U ground terminal installation bolt correctly. |
4.CHECK VDCCM&H/U GROUND CIRCUIT (CHECK FOR OPEN CIRCUIT). 1) Turn the ignition switch to OFF. 2) Measure the resistance between VDCCM&H/U connector and chassis ground. Connector & terminal (B310) No. 46 — Chassis ground: | Is the resistance less than 10 -- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1521 MOTOR RELAY | Repair the VDCCM&H/U ground harness. |
5.CHECK VDCCM&H/U MOTOR RELAY. Measure the resistance between VDCCM&H/U terminals. | Is the resistance 1 M- or more- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1521 MOTOR RELAY | Replace the VDCCM&H/U. VDC Control Module and Hydraulic Control Unit (VDCCM&H/U) |
6.CHECK POOR CONTACT OF CONNECTORS. Turn the ignition switch to OFF. | Is there poor contact of connector between generator, battery and VDCCM&H/U- | | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1521 MOTOR RELAY |
7.CHECK VDCCM&H/U. 1) Connect all connectors. 2) Perform the Clear Memory Mode. Clear Memory Mode 3) Perform the Inspection Mode. Inspection Mode 4) Read the DTC. Read Diagnostic Trouble Code (DTC) | Is the same DTC displayed- | Replace the VDCCM&H/U. VDC Control Module and Hydraulic Control Unit (VDCCM&H/U) | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1521 MOTOR RELAY |
8.CHECK DETECTION OF OTHER DTCS FOR VDC. Read Diagnostic Trouble Code (DTC) | Is any other DTC displayed- | Perform the diagnosis according to DTC. List of Diagnostic Trouble Code (DTC) | Currently, it is normal. There may have been a poor contact in the harness and connector or a temporarily noise interference. NOTE: Though the ABS warning light, and the VDC warning light & VDC indicator light may remain lit at this point, this is normal. Drive the vehicle at 40 km/h (25 MPH) or more in order to turn off the ABS warning light, and the VDC warning light & VDC indicator light. Be sure to drive the vehicle and check that the warning light goes off. |
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