TSRM/MK4 Supra/Repair Manual
Repair ManualWiring Diagrams
p.189
BE/Body Electrical Systems190 / 203
p.191
BODY ELECTRICAL SYSTEM — CRUISE CONTROL SYSTEM — MK4 Supra Body Electrical Systems, page 190
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BE–190 BODY ELECTRICAL SYSTEM – CRUISE CONTROL SYSTEM 1 Check operation of brake warning light. C Check that the brake warning light in the instrument panel comes on when the parking brake lever is pulled up with the engine running, and the light goes off when the parking brake lever is released. OK NG Check brake warning light circuit (See page BE–42). 2 Input signal check. C (1) See input signal check on page BE–169. (2) Check the indicator light when the parking brake lever is pulled up. Parking brake lever is pulled up ON OFF BE4006 OK The indicator light goes off when the parking brake lever is pulled up. NG OK Proceed to next circuit inspection shown on matrix chart (See page BE–170). 3 Check voltage between terminal PKB of cruise control ECU connector and body ground. ON IG ON BE3640 N0B765 PKB P Remove cruise control ECU with connectors still con- nected. C (1) Turn ignition switch ON. (2) Measure voltage between terminal PKB of cruise control ECU connector and body ground, when the parking brake lever is pulled up and released. OK Parking brake lever Voltage Pulled up Below 1 V Released 10 – 14 V NG OK Proceed to next circuit inspection shown on matrix chart (See page BE–170). 4 Check for open in harness and connector between cruise control ECU and brake warning light. OK NG Repair or replace harness or connector. Check and replace cruise control ECU.