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Acura RL (1996-2004 year). Manual - part 634

Diagnostic Trouble Code (DTC) Chart

NOTE: Before you proceed with the appropriate flowchart(s), check power and ground as described in the tests on page

23-206.

DTC

Symptom

Seat can't be adjusted with the slide
switch.

Seat can't be adjusted with the reclining
switch.

Seat front height can't be adjusted with

the front up-down switch.

Seat rear height can't be adjusted with the

rear up-down switch.

Steering column can't be adjusted with
the tilt switch.

Steering column can't be adjusted with
the extend-retract switch.

Positions can't be stored with the ignition
switch ON (II) and the MEMO button
pressed.

Positions can't be stored or retrieved with
position button 1.

Positions can't be stored or retrieved with
position button 2.

Seat can't be adjusted forward with the
slide switch.

Seat can't be adjusted backward with the
slide switch.

Seat can't be adjusted forward with the
recline switch.

Seat can't be adjusted backward with the
recline switch.

Seat front height can't be adjusted with
the front up switch.

Seat front height can't be adjusted with

the front down switch.

Seat rear height can't be adjusted with the

rear up switch.

Seat rear height can't be adjusted with the
rear down switch.

Steering column can't be adjusted with

the tilt-up switch.

Steering column can't be adjusted with
the tilt-down switch.

Steering column can't be adjusted with
the extend switch.

Steering column can't be adjusted with
the retract switch.

Steering column doesn't tilt up and retract
when the ignition key is pulled out.

Steering column doesn't tilt up, or the
steering column position cannot be
retrieved with the shift lever in

Possible Cause

Fault in slide switch or slide switch wiring

Fault in recline switch or recline switch

wiring

Fault in front up-down switch or front
up-down switch wiring

Fault in rear up-down switch or rear
up-down switch wiring

Fault in tilt switch or tilt switch wiring

Fault in extend-retract switch or
extend-retract switch wiring

Fault in MEMO button wiring or common

wiring of switches

Fault in position button 1 wiring or

common wiring of switches

Fault in position button 2 wiring or
common wiring of switches

Fault in forward slide switch wiring or

common wiring of switches

Fault in backward slide switch wiring or
common wiring of switches

Fault in forward recline switch wiring or

common wiring of switches

Fault in backward recline switch wiring or
common wiring of switches

Fault in front up switch wiring or common

wiring of switches

Fault in front down switch wiring or
common wiring of switches

Fault in rear up switch wiring or common

wiring of switches

Fault in rear down switch wiring or
common wiring of switches

Fault in tilt-up switch wiring or common

wiring of switches

Fault in tilt-down switch wiring or
common wiring of switches

Fault in extend switch wiring or common

wiring of switches

Fault in retract switch wiring or common

wiring of switches

Fault in the ignition switch or ignition
switch wiring

Fault in the transmission range switch or

transmission range switch

Flowchart

Page

Main Menu

Table of Contents

Driving Position Memory System (DPMS)

Troubleshooting Guide

After completing the pre-troubleshooting tests (see page

23-204

), select the flowchart(s) listed on the next page for the

symptom(s) you want to troubleshoot. If the symptom(s) are related to automatic adjusting, first read the explanation for
the automatic adjustment modes.

Automatic Adjustment Modes

Mode 1: When the ignition key is pulled out (ignition switch turned OFF) with the AUTO switch ON and the vehicle parked

the steering column automatically moves to the highest tilt position and the fully-retracted

position to ease exit from the vehicle.

Mode 2: When the ignition key is inserted at the end of mode 1, without turning the ignition switch ON (II) and the vehicle

parked the steering column will return to the position it was in before mode 1 began.

Mode 3: When one of position buttons is pressed with the vehicle parked and the ignition key is inserted,

the steering column, the seat and the mirrors will move to their memorized positions.

NOTE: The priority of the automatic adjustments are shown:

• If the ignition key is not inserted, the steering column

is not adjusted at No. 3 to No. 4. It will be adjusted at
No. 9 to No. 10 only after the key is inserted.

• If the ignition key is inserted while No. 1 and No. 2

are carried out, the steering column will be adjusted

at No. 3 and No. 4.

Priority

2
3
4
5
6
7
8
9

Devices

Seat slide (backward), mirror
Seat recline (backward)
Tilt
Extend-retract
Seat slide (forward)
Seat recline (forward)
Seat front up-down
Seat rear up-down
Tilt
Extend-retract

Main Menu

Table of Contents

Automatic Adjustments

Symptom

Adjustment mode 1 doesn't work.

Adjustment mode 2 doesn't work.

Adjustment mode 3 doesn't work.

Flowchart

Page

23-206

23-209

Manual Adjustments

Symptom

The steering column doesn't work.

The driver's power seat doesn't work.

The power mirror doesn't work with the ignition switch ON (II).

Flowchart(s)

7,8

3, 4, 5, 6

Page(s)

Others

Symptom

The driving position cannot be stored.

The position button indicators do not come on or do not blink.

Flowchart

Page

23-220

23-224

Communication Lines:

NOTE: There are two communication lines between the steering column control unit and the power seat control unit, and

two communication lines between the steering column control unit and the power mirror control unit. If one communica-
tion line is faulty, the systems still functions via the other line. If the automatic adjustments stop working, but each compo-

nent can still be adjusted manually, then both communication lines are faulty.

Main Menu

Table of Contents

Driving Position Memory System (DPMS)

12P CONNECTOR "A"

16P CONNECTOR "B"

8P CONNECTOR "C"

Power Seat Control Unit:

12P CONNECTOR "A"

16P CONNECTOR "B"

12P CONNECTOR "C"

Power Mirror Control Unit:

Pre-troubleshooting Tests

Before troubleshooting the DTC(s) indicated by the LEDs in the position buttons of the memory switch, or before selecting
a flowchart from the troubleshooting guide on page

23-202

, make the following tests to check power and ground.

NOTE:
• Be careful not to cause shorts or damage wire insulation when back-probing.
• In the tests, "column control unit" stands for "steering column control unit", mirror control unit" stands for "power

mirror control unit", seat control unit" stands for "power seat control unit".

• All connector views are from 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, make voltage and continuity checks at the connectors.

Steering Column Control Unit:

12P CONNECTOR "A"

16P CONNECTOR "B"

RED/YEL ('96 - 98 models) or WHT/YEL ('99 model)

LT GRN/RED WHT/YEL

BLK/WHT YEL/BLK BLK

BLK

LT GRN/RED BLK/YEL WHT/YEL

BLK/WHT BLK

LT GRN/RED BLK/YEL WHT/YEL

BLK WHT/RED

BLK RED/WHT

Main Menu

Table of Contents

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