Scheme 38
Scheme 38: Circuit Diagram
Scheme 39
Scheme 39: Control Unit Input Test
Scheme 40
- Before testing, troubleshoot the multiplex integrated control system using B-CAN System Diagnosis Test Mode A (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) ). Multiplex Integrated Control Unit
- Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/tsx/i-2003-2008/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ).
- Disconnect under-dash fuse/relay box connectors F, H and P. NOTE: All connectors are shown from the wire side of female terminals.
- Inspect the connector and socket terminals to be sure they are all making good contact. If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system. If the terminals are OK, go to step 5.
- Reconnect the connectors, and make these input tests at the connector. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, go to step 6. TEST CONDITION REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained F14 H14 BLU/RED Ignition switch ON (II), driver's seat belt is unbuckled. Measure the voltage to ground: There should be less than 1 V. Faulty driver's seat belt buckle switch Poor ground (G601) An open in the wire Ignition switch ON (II), driver's seat belt is buckled. Measure the voltage to ground: There should be 5 V or more. Faulty driver's seat belt buckle switch Short to ground P13 RED/WHT*1 RED*2 Ignition key in the ignition switch Measure the voltage to ground: There should be less than 1 V. Faulty ignition switch Poor ground (G501) An open in the wire Ignition key out of the ignition switch Measure the voltage to ground: There should be 5 V or more. Faulty ignition switch Short to ground
- Remove the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/i-2003-2008/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ).
- Disconnect gauge control module connectors A and B. NOTE: All connectors are shown from the wire side of female terminals.
- Inspect the connector and socket terminals to be sure they are all making good contact. If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system. If the terminals are OK, go to step 9.
- Reconnect the connectors, and make these input tests at the connector. If any test indicates a problem, find and correct the cause, then recheck the system. If the input tests prove OK, go to step 10. TEST CONDITION REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A13 RED/WHT (1) RED (2) Engine OFF Check for continuity to ground: There should be continuity. Faulty oil pressure switch An open in the wire Engine running Check for continuity to ground: There should be no continuity. Mechanical problem in the engine Faulty oil pressure switch An open in the wire B9 BLK Under all conditions Measure the voltage to ground: There should be less than 1 V. Poor ground (G501) An open in the wire (1) '04-05 models (2) '06-08 models
- Perform the Gauge Self-diagnosis Function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/tsx/i-2003-2008/remont/gauges-instrument-panels/#display-and-gauge-system__self-diagnostic-function) ). If the beeper sounds and the seat belt reminder light flashes, go to step 11. If the beeper does not sound or the seat belt reminder light does not flash, replace the gauge control module.
- Substitute a known-good under-dash fuse/relay box and recheck the system. If the symptom is gone, the multiplex integrated control unit (MICU) is faulty; replace the under-dash fuse/relay box. If the symptom is still present, the gauge control module is faulty; replace the gauge control module.
