Entry Lights Control System — Acura RL II (2004-2008)

Scheme 30

Scheme 30: Component Location Index

Scheme 31

Scheme 31: Circuit Diagram

Scheme 32

Control Unit Input Test

Note. Before testing, troubleshoot the multiplex integrated control system first using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ), and make sure the Keyless Access System operates normally.

Scheme 33

Scheme 33: MICU

Scheme 34

Scheme 35

Scheme 36

Scheme 37

Turn the ignition switch OFF.
Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/rl/ii-2004-2008/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ).
Disconnect the driver's under-dash fuse/relay box connectors. NOTE: All connector views 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 5.
With the connectors still disconnected, make these input tests at the connectors. 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. POSSIBLE CAUSE REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained P8 PNK Under all conditions Attach to ground: The driver's and front passenger's foot lights should come on. Blown No. 6 (7.5A) fuse in the driver's under-dash fuse/relay box Faulty foot light An open in the wire H14 ORN Under all conditions Attach to ground: The ignition key light should come on. Blown No. 7 (10A) fuse in the driver's under-dash fuse/relay box Faulty ignition key light An open in the wire W4 PNK Interior lights switch in DOOR position Attach to ground: The individual map lights should come on. Blown No. 6 (7.5A) fuse in the driver's under-dash fuse/relay box Faulty map light Faulty roof console An open in the wire
Reconnect the connectors to the driver's under-dash fuse/relay box, and make these input tests at the connectors. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, the MICU must be faulty, replace the driver's under-dash fuse/relay box (see «DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/body-electrical/#under-dash-fuserelay-box) ). POSSIBLE CAUSE REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained P1 BRN Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground(G502) An open in the wire E9 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground (G601) An open in the wire H9 BLK DRIVER'S MPCS UNIT
Turn the ignition switch OFF.
Remove the driver's door panel (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/exterior-body-panels/#doors__front-door-panel-removalinstallation) ).
Disconnect driver's MPCS unit connector A (40P).
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 11.
With the connector still disconnected, 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 12. POSSIBLE CAUSE REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A8 GRY Driver's under-dash fuse/relay box connector H (14P) and power window master switch 6P connector disconnected Check for continuity between the A8 terminal and driver's under-dash fuse/relay box connector H (14P) No. 4 terminal: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire
Reconnect the connector to the driver's MPCS unit, turn the ignition switch ON (II), and make these 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 13. POSSIBLE CAUSE REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A7 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 15 (40A) fuse in the under-hood fuse/relay box Blown No. 7 (10A) fuse in the driver's under-dash fuse/relay box Faulty driver's under-dash fuse/relay box An open in the wire A3 GRN Driver's door open Measure the voltage to ground: There should be less than 1 V. Faulty driver's door switch An open in the wire Driver's door closed Measure the voltage to ground: There should be 5 V or more. Faulty driver's door switch A short to ground in the wire A21 BLU Driver's door key cylinder in UNLOCK Measure the voltage to ground: There should be less than 1 V. Faulty driver's door key cylinder switch An open in the wire Driver's door key cylinder in neutral or LOCK Measure the voltage to ground: There should be 5 V or more. Faulty driver's door key cylinder switch A short to ground in the wire FRONT PASSENGER'S MPCS UNIT
Turn the ignition switch OFF.
Remove the front passenger's door panel (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/exterior-body-panels/#doors__front-door-panel-removalinstallation) ).
Disconnect front passenger's MPCS unit connector A (28P).
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 17.
With the connector still disconnected, 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 18. POSSIBLE CAUSE REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A4 GRY Driver's under-dash fuse/relay box connector X (39P) and right rear power window switch 14P connector disconnected Check for continuity between the A4 terminal and driver's under-dash fuse/relay box connector X (39P) No. 15 terminal: There should be continuity. Faulty passenger's under-dash fuse/relay box An open in the wire Check for continuity to ground: There should be no continuity. Faulty passenger's under-dash fuse/relay box A short to ground in the wire
Reconnect the connector to the front passenger's MPCS unit, 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 19. POSSIBLE CAUSE REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A2 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 15 (40A) fuse in the under-hood fuse/relay box Blown No. 7 (10A) fuse in the driver's under-dash fuse/relay box Faulty driver's under-dash fuse/relay box Faulty passenger's under-dash fuse/relay box An open in the wire A28 LT GRN Front passenger's door open Measure the voltage to ground: There should be less than 1 V. Faulty front passenger's door switch An open in the wire Front passenger's door closed Measure the voltage to ground: There should be 5 V or more. Faulty front passenger's door switch A short to ground in the wire LEFT REAR POWER WINDOW SWITCH
Turn the ignition switch OFF.
Remove the left rear power window switch (see «POWER WINDOW MASTER SWITCH REPLACEMENT»(/acura/rl/ii-2004-2008/remont/windows/#power-windows) ).
Disconnect the 14P connector from the left rear power window switch.
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 23.
With the connector still disconnected, 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 24. POSSIBLE CAUSE REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 11 (1) WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 6 (7.5A) fuse in the driver's under-dash fuse/relay box Faulty driver's under-dash fuse/relay box An open in the wire 13 (1) LT BLU Left rear door open Measure the voltage to ground: There should be less than 1 V. Faulty left rear door switch An open in the wire Left rear door closed Measure the voltage to ground: There should be 5 V or more. Faulty left rear door switch A short to ground in the wire 2 GRY Driver's under-dash fuse/relay box connector J (21P) disconnected Check for continuity between the No. 2 terminal and driver's under-dash fuse/relay box connector J (21P) No. 1 terminal: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire (1) Reconnect the left rear power window switch 14P connector. RIGHT REAR POWER WINDOW SWITCH
Turn the ignition switch OFF.
Remove the right rear power window switch (see «POWER WINDOW MASTER SWITCH REPLACEMENT»(/acura/rl/ii-2004-2008/remont/windows/#power-windows) ).
Disconnect the 14P connector from the right rear power window switch.
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 28.
With the connector still disconnected, 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 29. POSSIBLE CAUSE REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 11 (1) WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 15 (40A) fuse in the under-hood fuse/relay box Blown No. 6 (7.5A) fuse in the driver's under-dash fuse/relay box Faulty driver's under-dash fuse/relay box Faulty passenger's under-dash fuse/relay box An open in the wire 13 (1) LT BLU Right rear door open Measure the voltage to ground: There should be less than 1 V. Faulty right rear door switch An open in the wire Right rear door closed Measure the voltage to ground: There should be 5 V or more. Faulty right rear door switch A short to ground in the wire 2 GRY Driver's under-dash fuse/relay box connector X (39P) and passenger's MPCS unit connector A (28P) disconnected Check for continuity between the No. 2 terminal and driver's under-dash fuse/relay box connector X (39P) No. 15 terminal: There should be continuity. Faulty passenger's under-dash fuse/relay box An open in the wire Check for continuity to ground: There should be no continuity. Faulty passenger's under-dash fuse/relay box A short to ground in the wire (1) Reconnect the right rear power window switch 14P connector.
If multiple failures are found on more than one control unit, replace the driver's under-dash fuse/relay box (includes the MICU). If input failures are related to a particular control unit, replace the control unit.

Scheme 38

Scheme 38: Ignition Key Switch Test

Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/exteriorinterior-trim/#dashboard) ), and the driver's dashboard lower cover (see «DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/exteriorinterior-trim/#dashboard) ), then remove the steering column covers (see «DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/exteriorinterior-trim/#dashboard) ).
Disconnect the 10P connector (A) from the ignition switch control unit.
Check for continuity between the No. 3 and No. 6 terminals. There should be continuity with the key in the ignition switch. There should be no continuity with the key removed.
If the continuity is not as specified, replace the ignition switch control unit.

Scheme 39

Scheme 39: Ignition Key Light Test

Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/exteriorinterior-trim/#dashboard) ), and the driver's dashboard lower cover (see «DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/exteriorinterior-trim/#dashboard) ), then remove the steering column covers (see «STEERING COLUMN REMOVAL AND INSTALLATION»(/acura/rl/ii-2004-2008/remont/manual-power-steering/#power-steering-system-electronic-power-steering-system__steering-column-removal-and-installation) ).
Disconnect the 10P connector (A) from the ignition switch control unit.
The LED should come on when power is connected to the No. 9 terminal and ground is connected to the No. 2 terminal.
If the LED does not come on, replace the ignition switch control unit (see «IGNITION SWITCH KNOB REPLACEMENT»(/acura/rl/ii-2004-2008/remont/door-locks-anti-theft-systems/#keyless-access-system) ).

Entry Lights Control System Acura RL II