Ventilated Seat - Canada Acura RL II

Scheme 110

Scheme 111

Self-diagnostic Function

The seat ventilation control unit has a thermistor self-diagnostic function. The control unit checks for an open or short in the thermistor, and it indicates the result by lighting the LEDs of the seat ventilation switch.

Entering the self-diagnostic function

1. Turn the ignition switch ON (II), and do the next step within 5 seconds.
2. Push the DOWN side of the seat ventilation switch three times, and the UP side six times, then the DOWN side three times.
3. If the system enters the self-diagnostic mode, all of the LEDs (A) turn on for 6 seconds, then indicate the result. If the three LEDs of the heater side turn on, the thermistor is faulty. If no LED turns on, the thermistor is OK. NOTE: The system has a timer function. The fan motor timer: About 15 minutes after the fan motor HIGH position is ON, the control unit changes the fan motor speed and switch LED indicators from Hi to Mid. The seat heater timer: About 5 minutes after the heater temperature rises over 140°F (60°C), the control unit changes the heater temperature and switch LED indicators from Hi to Mid. The seat heater timer: About an hour after the heater temperature rises over 115°F (46°C), the control unit changes the heater temperature and switch LED indicators from Mid to LO.

Ending the self-diagnostic function

Turn the ignition switch OFF, and the self-diagnostic mode is exited.

Scheme 112

Scheme 113

Control Unit Input Test

Note. Before testing, check the No. 22 (AS F/B) (70A) fuse in the under-hood fuse/relay box, the No. 30 (7.5A) fuse in the driver's under-dash fuse/relay box, and the No. 6 (20A) fuse in the passenger's under-dash fuse/relay box.

Scheme 114

1. Remove the driver's or front passenger's seat (see «FRONT SEAT REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/seats/#seats__front-seat-removalinstallation) ).
2. Disconnect the 26P connector (A) from the seat ventilation control unit (B).
3. 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.
4. Reconnect the 26P connector to the control 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 5. WIRE CAVITY REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 12 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground (G601, G651 (1) ) An open in the wire 13 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground (G601, G651 (1) ) An open in the wire 1 BLK/YEL Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Blown No. 21 (10A) fuse in the driver's under-dash fuse/relay box Faulty driver's under-dash fuse/relay box An open in the wire (1) Front passenger's seat
5. Disconnect the 26P connector from the control 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, the control unit must be faulty; replace it. WIRE CAVITY REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 3 BLK Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Blown No. 6 (20A) fuse in the passenger's under-dash fuse/relay box Poor ground (G506) Faulty seat heater relay Faulty seat heater Faulty passenger's under-dash fuse/relay box An open in the wire 4 BRN/BLK Under all conditions Check for continuity between the No. 4 and No. 5 terminals: There should be continuity. Faulty seat heater An open in the wire 5 BRN 6 PNK Ignition switch ON (II) Attach to ground: The seat cushion rear fan motor should run. Poor ground (G506, G601, G651 (1) ) Faulty seat heater relay Faulty seat cushion rear fan motor Faulty passenger's under-dash fuse/relay box An open in the wire 7 BLU Ignition switch ON (II) Attach to ground: The seat-back fan motor should run. Poor ground (G506, G601, G651 (1) ) Faulty seat heater relay Faulty seat cushion rear fan motor Faulty passenger's under-dash fuse/relay box An open in the wire 8 YEL Ignition switch ON (II) Attach to ground: The seat cushion front fan motor should run. Poor ground (G506, G601, G651 (1) ) Faulty seat heater relay Faulty seat cushion rear fan motor Faulty passenger's under-dash fuse/relay box An open in the wire 14 WHT/RED Ignition switch ON (II), seat ventilation switch UP side pushed Check for voltage to ground: There should be battery voltage. Blown No. 21 (10A) fuse in the driver's under-dash fuse/relay box Faulty seat ventilation switch An open in the wire 15 WHT/BLK Ignition switch ON (II), seat ventilation switch DOWN side pushed Check for voltage to ground: There should be battery voltage. Blown No. 21 (10A) fuse in the driver's under-dash fuse/relay box Faulty seat ventilation switch An open in the wire 17 RED/GRN Ignition switch ON (II) Attach to ground: The seat heater HIGH indicator should come on. Blown No. 21 (10A) fuse in the driver's under-dash fuse/relay box Faulty seat ventilation switch An open in the wire 18 RED/YEL Ignition switch ON (II) Attach to ground: The seat heater MIDDLE indicator should come on. Blown No. 21 (10A) fuse in the driver's under-dash fuse/relay box Faulty seat ventilation switch An open in the wire 19 RED/WHT Ignition switch ON (II) Attach to ground: The seat heater LOW indicator should come on. Blown No. 21 (10A) fuse in the driver's under-dash fuse/relay box Faulty seat ventilation switch An open in the wire 20 BLU/GRN Ignition switch ON (II) Attach to ground: The seat fan HIGH indicator should come on. Blown No. 21 (10A) fuse in the driver's under-dash fuse/relay box Faulty seat ventilation switch An open in the wire 21 BLU/YEL Ignition switch ON (II) Attach to ground: The seat fan MIDDLE indicator should come on. Blown No. 21 (10A) fuse in the driver's under-dash fuse/relay box Faulty seat ventilation switch An open in the wire 22 BLU/WHT Ignition switch ON (II) Attach to ground: The seat fan LOW indicator should come on. Blown No. 21 (10A) fuse in the driver's under-dash fuse/relay box Faulty seat ventilation switch An open in the wire (1) Front passenger's seat

Scheme 115

1. Remove the driver's seat (see «FRONT SEAT REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/seats/#seats__front-seat-removalinstallation) ).
2. Disconnect the 4P connector (A) and 2P connector (B) from the seat heater.
3. Check for continuity between the A4 and B1 terminals of the drivers' seat wire harness side. There should be continuity. If there is no continuity, check for an open in the driver's seat wire harness. If the wire harness is OK, replace the seat-back heater.
4. Check for continuity between the A1 and A4 terminals, the A1 and B1 terminals, and the A2 and A3 terminals. There should be continuity.
5. If the continuity is not as specified, replace the appropriate seat heater.

Scheme 116

1. Remove the passenger's seat (see «FRONT SEAT REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/seats/#seats__front-seat-removalinstallation) ).
2. Disconnect the 4P connector (A) from the seat heater.
3. Check for continuity between the No. 1 and No. 4 terminals, and the No. 3 and No. 2 terminals of the 4P connector. There should be continuity.
4. If the continuity is not as specified, replace the seat heater.

Scheme 117

1. Remove the center console panel (see «CENTER CONSOLE REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/exteriorinterior-trim/#consoles__center-console-removalinstallation) ).
2. Disconnect the 14P connector from the seat ventilation switch (A).
3. Remove the two screws and the switch.
4. Check for continuity between the No. 10 and No. 14 terminals. There should be continuity when the switch UP side is pushed. There should be no continuity when the switch is released.
5. Check for continuity between the No. 11 and No. 14 terminals. There should be continuity when the switch DOWN side is pushed. There should be no continuity when the switch is released.
6. If the continuity check is not as specified, replace the seat ventilation switch. Indicator check
7. Swap the driver's and passenger's switch, and check the indicators. If the indicators come on normally, replace the original switch. If any of the indicators does not come on, check the wire harness between the switch and the seat ventilation control unit. If wire is OK, replace the seat ventilation control unit.

Scheme 118

Scheme 119

1. Remove the driver's or front passenger's seat (see «FRONT SEAT REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/seats/#seats__front-seat-removalinstallation) ).
2. For checking the seat-back fan motor, remove the seat-back panel (see «FRONT SEAT-BACK COVER REPLACEMENT»(/acura/rl/ii-2004-2008/remont/seats/#seats__front-seat-back-cover-replacement) ).
3. Disconnect the 3P connector (A) from each fan motor (B). Seat Cushion Seat-back
4. Connect battery power to fan motor 3P connector No. 1 terminal and ground the No. 3 terminal. The motor should run.
5. If the motor does not run or fails to run smoothly, replace the motor.

See also:
• FRONT SEAT REMOVAL/INSTALLATION
• CENTER CONSOLE REMOVAL/INSTALLATION
• FRONT SEAT-BACK COVER REPLACEMENT