Multiplex Integrated Control Unit Input Test

1. Remove the left side kick panel. Disconnect the under-dash fuse/relay box connectors D, E, H, I, J, K, N, P and X. NOTE: All connectors are 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 look OK, go to Step 4 . With the connectors still disconnected from the under-hood fuse/relay box, make these input tests at the connector(s). 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 5 .
   Cavity | Wire | Test condition | Test: Desired result | Possible cause if result is not obtained
   --- | --- | --- | --- | ---
   H9 | BLK | Under all conditions | Check for continuity to ground: There should be continuity. | Poor ground (G601) An open in the wire
   P1 *1 P14 *2 | BRN | Under all conditions | Check for continuity to ground:There should be continuity. | Poor ground (G502) An open in the wire
   E9 | BLK | Under all conditions | Check for continuity to ground: There should be continuity. | Poor ground (G601) An open in the wire
   D6·J9·X34 | YEL | Ignition switch ON (II) | Check for voltage to ground: There should be battery voltage. | Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box An open in the wire
   K4 | GRN/WHT | Under all conditions | Check for voltage to ground: There should be battery voltage. | Blown No. 27 (20 A) fuse in the under-dash fuse/relay box An open in the wire
   X35 | WHT | Under all conditions | Check for voltage to ground: There should be battery voltage. | Blown No. 7 (10 A) fuse in the under-dash fuse/relay box An open in the wire
   N22 | LT BLU | Under all conditions | Check for continuity between terminal N22 and the climate control unit B (16P) connector terminal No. 14: There should be continuity. | An open in the wire
   Climate control unit B (16P) connector disconnected | Check for continuity to ground: There should be no continuity. | Short to ground
   J4 | BRN/RED | Under all conditions | Check for continuity between terminal J4 and power window master switch 23P connector terminal No. 16: There should be continuity. | An open in the wire
   Power window master switch 23P connector disconnected | Check for continuity to ground: There should be no continuity. | Short to ground
   D11 | BLU | Under all conditions | Check for continuity between terminal D11 and relay module J (10P) connector terminal No. 7: There should be continuity. | An open in the wire
   Relay module J (10P) connector disconnected | Check for continuity to ground: There should be no continuity. | Short to ground
   X27 | LT GRN | Under all conditions | Check for continuity between terminal X27 and wiper/washer switch 8P connector terminal No. 4: There should be continuity. | An open in the wire
   Wiper/washer switch 8P connector disconnected | Check for continuity to ground: There should be no continuity. | Short to ground
   N28 | WHT | Under all conditions | Check for continuity between terminal N28 and gauge assembly (30P) connector terminal No. 25: There should be continuity. | An open in the wire
   Gauge assembly B (30P) connector disconnected | Check for continuity to ground: There should be no continuity. | Short to ground
   G1 | GRN/RED | Under all conditions | Check for continuity between terminal G1 and power tailgate control unit connector A (26P) terminal No. 21: There should be continuity. | An open in the wire
   *1: | LHD type
   *2: | RHD type
1. Reconnect the connectors to the under-dash fuse/relay box, and make sure these input tests at the appropriate connectors on the under-dash fuse/relay box. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, the multiplex integrated contorl unit must be faulty, replace the under-dash fuse/relay box assembly.
   Cavity | Wire | Test condition | Test: Desired result | Possible cause if result is not obtained
   --- | --- | --- | --- | ---
   P7 *1 P8 *2 | ORN | Under all conditions | Attach to ground: The ignition key light should come on. | Blown No. 13 (20 A) fuse in the under-hood fuse/relay box Blown LED An open in the wire
   I4 | GRN/RED | Ceiling light switch in the middle position, all doors closed | Attach to ground: The ceiling light should come on. | Blown No. 6 (7.5 A) fuse in the under-dash fuse/relay box Faulty ceiling light An open in the wire
   *1: | LHD type
   *2: | RHD type