Memory Systems Chevrolet Corvette C5

DESCRIPTION

The memory system includes driver's seat, outside mirrors, telescoping steering column (if equipped), climate control and stereo functions. When a memory function recall is requested, Seat Control Module (SCM) and Door Control Modules (DCM) will apply voltage to appropriate seat position and mirror position motors until position sensor voltage matches the stored values. The seat control module controls movement of 3 driver's seat position motors and steering column position. Left and right door control modules control 2 left mirror motors and 2 right mirror motors. All motors have a position sensor, and work independently of each other. Lumbar control is not part of memory functions.

MEMORY MIRRORS

Note. For additional information on power mirrors, see POWER MIRRORS - CORVETTE article.

Door Control Modules (DCM) recall mirror positions. DCMs receive mirror horizontal and vertical position signals from mirror position sensors. Signals are used by DCMs for memory recall functions to determine horizontal and vertical position of both mirrors. Horizontal and vertical position sensors are variable resistors. DCMs provides 5 volt supply and ground to position sensors. DCMs monitor voltage level through position sensors through signal circuit. When memory No. 1 or memory No. 2 switch is pressed, a ground is supplied through memory switch circuit to Left Door Control Module (LDCM) and memory No. 1 or memory No. 2 input is pulled low. When LDCM detects low voltage on a memory input, LDCM will activate appropriate memory functions and also send a message on the serial data line to other systems responsible for memory recall functions (RDCM, radio, seats, HVAC). When LDCM sends a memory recall message on the serial data line, RDCM will command right mirror motor in appropriate direction until stored position sensor voltage level is achieved.

MEMORY SEATS

Note. For additional information on power seats, see POWER SEATS - CORVETTE article.

Power seat switch assembly sends input signals to the Seat Control Module (SCM). Horizontal, front vertical, and rear vertical seat adjuster motors located within the lower motor assembly, are outputs of the SCM. Driver's seat position memory settings are stored in the SCM. Adjuster motor position sensors are located within lower motor assembly, and are inputs to the SCM. The SCM uses position sensor inputs when storing and recalling memory settings. Memory seat, and easy enter/exit operations are performed by the SCM. The Left Door Control Module (LDCM) controls when memory settings are stored and recalled by use of serial data line. The Body Control Module (BCM) controls when the easy enter/exit operation occurs, by use of serial data line. BCM stores Regular Production Option (RPO) code configuration that sends signals to SCM whether or not power tilt/telescoping steering column option is active. RPO code is located on service parts ID label located inside glove box on door. RPO code for power tilt/telescoping steering column is N37. This RPO code configuration must be correct and received by SCM or power seat and telescoping steering column operation will be inoperative or incorrect.

MEMORY STEERING COLUMN

Note. For additional information on power steering column, see STEERING COLUMN SWITCHES - CORVETTE article.

Power tilt/telescoping steering column memory settings are stored in the Seat Control Module (SCM). Steering column position sensor is an internal part of telescoping actuator assembly and is an input to SCM. SCM uses position sensor input when storing and recalling memory settings. Memory steering column and easy enter/exit operations are performed by the SCM. However Left Door Control Module (LDCM) controls when memory settings are stored and recalled by use of the serial data line. Body Control Module (BCM) controls when the easy enter/exit operation occurs, by use of the serial data line. BCM stores Regular Production Option (RPO) code configuration which signals to the SCM whether or not tilt/telescoping steering column option is active. RPO code is located on service parts ID label located inside glove box on door. RPO code for power tilt/telescoping steering column is N37. This RPO code configuration received by the SCM must be correct or power seat and telescoping steering column operation will be inoperative or incorrect.

POSITION SENSORS

Position sensors are used by memory seat/mirror/steering column modules to store motor positions in memory and return motors to stored memory positions. Each sensor is a potentiometer, and is mounted to each motor's transmission cable. When cable rotates, resistance of potentiometer varies, and feedback voltage is monitored by memory seat/mirror module to determine motor position. The memory seat/mirror module stores motor positions by recording each position sensor feedback voltage. When a memorized position is requested, each motor is moved until the position sensor feedback voltage equals feedback voltage stored in memory.

COMPONENT LOCATIONS

COMPONENT LOCATIONS

Scheme 1

MEMORY SET

Memory recall can be set for up to 3 drivers. To program memory settings, move seat to most comfortable position. Move mirrors to desired position. Move telescoping steering column (if equipped) to desired position. Depress and hold the No. 1 memory button, located on left door armrest, until the indicator light above the memory button glows steady. Continue to hold button down. When the position has been stored, indicator light should glow steady for one second, then will flash once. To record the second setting, repeat function and depress the No. 2 button. For the third setting, depress No. 1 and 2 buttons simultaneously.

MEMORY RECALL

To recall a position, depress memory button that corresponds with setting for appropriate driver. For memory position No. 1, press memory switch button No. 1. For memory position No. 2, press memory switch button No. 2. For memory position No. 3, press memory switch buttons No. 1 and 2 simultaneously. Seat Control Module (SCM) and Left Door Control Module (LDCM) receives memory request, then supplies battery voltage to seat, steering column (if equipped) and mirror motors until all seat and mirror position sensor feedback voltages equal voltages stored in memory for appropriate driver. LDCM will also send a message over serial data line to other systems responsible for memory recall functions (climate control and radio). Indicator light will flash until programmed position is achieved. Memory recall will not work if the vehicle is moving, the key is out of the ignition switch or if a seat or memory switch is being used.

PRELIMINARY CHECKS

1. If circuit breakers PWR ST/DRV No. 35 (20-amp) and PWR ST/PAS No. 36 (20-amp), located in instrument panel electrical center, opens whenever power seat switch is operated, check circuits for a short to ground. Check SCM-L fuse No. 4 (10-amp), DCM-R fuse No. 30 (10-amp), PWRFDR fuse No. 31 (25-amp), DCM-L fuse No. 33 (10-amp) and PWRFDL fuse No. 34 (25-amp) located in instrument panel electrical center. Check for good, clean ground connections. See «WIRING DIAGRAMS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems) . Check for proper installation of aftermarket electronic equipment.
2. Check for broken or partially broken wire inside of insulation, which could cause system malfunction but prove good in a continuity/voltage check with system disconnected. These circuits may be intermittent or resistive when loaded. Check by monitoring for voltage drop with system under load.

SELF-DIAGNOSTIC SYSTEM

Note. For additional DTC related testing for power seats, mirrors and steering column, see POWER SEATS , POWER MIRRORS or STEERING COLUMN SWITCHES - CORVETTE article.

Instrument Panel Cluster (IPC) and scan tool can be used to retrieve and clear DTCs. For IPC procedure, see ANALOG INSTRUMENT PANELS - CORVETTE article.

DIAGNOSTIC SYSTEM CHECK

1. Connect scan tool to Data Link Connector (DLC) located under steering column. If scan tool powers up, go to next step. If scan tool does not power up, go to «SCAN TOOL DOES NOT POWER UP»(/chevrolet/corvette/c5-1997-2004/remont/body-cab-control-systems/#body-control-modules__scan-tool-does-not-power-up) under SELF-DIAGNOSTIC SYSTEM in BODY CONTROL MODULES - CORVETTE article.
2. Turn ignition on. Attempt to establish communication with the Left Door Control Module (LDCM), Right Door Control Module (RDCM), Seat Control Module (SCM), Body Control Module (BCM) and Powertrain Control Module (PCM). If scan tool communicates with all systems, go to next step. If scan tool does not communicate with all systems, go to «SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/chevrolet/corvette/c5-1997-2004/remont/body-cab-control-systems/#body-control-modules) under SELF-DIAGNOSTIC SYSTEM in BODY CONTROL MODULES - CORVETTE article.
3. Using scan tool, retrieve DTCs from modules listed in step 2 . If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, diagnose by symptom.
4. If scan tool displays any DTCs which begin with "U", go to «SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/chevrolet/corvette/c5-1997-2004/remont/body-cab-control-systems/#body-control-modules) under SELF-DIAGNOSTIC SYSTEM in BODY CONTROL MODULES - CORVETTE article. If scan tool does not display any DTCs that begin with "U", go to next step.
5. If DTC B0605 is not set, go to next step. If DTC B0605 is set, go to «BODY CONTROL MODULE DIAGNOSTIC SYSTEM CHECK»(/chevrolet/corvette/c5-1997-2004/remont/body-cab-control-systems/#body-control-modules__body-control-module-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM in BODY CONTROL MODULES - CORVETTE article.
6. If DTC P0562 or P0563 are set, go to appropriate powertrain On-Board Diagnostic (OBD) system check in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If DTC P0562 or P0563 are not set, perform appropriate test under DIAGNOSTIC TESTS. See «MEMORY SYSTEM DIAGNOSTIC TROUBLE CODES (DTCs)»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems) table.

MEMORY SYSTEM DIAGNOSTIC TROUBLE CODES (DTCs)

DIAGNOSTIC TESTS

Circuit Description

Seat Control Module (SCM) has 2 main power feeds (high and low) and one main ground. Low power feed (battery 1) is used to provide power for SCM logic and internal driver operation. High power feed (battery 2) is used to provide power for systems that draw higher amounts of current (motor, lights, etc.). For most functions, SCM will operate properly when vehicle system voltage is 9.0-16.0 volts. SCM also monitors voltage level at battery 1 and battery 2 circuits, and can determine if voltage level received is out of range.

DTC B0846 will set if SCM detects battery 2 voltage range less 8.5 volts or more than 16.3 volts for more than 2 seconds. DTC B0846 will store as a history code in SCM memory. No driver warning will be displayed. DTC can only set as history even if malfunction is current.

Under all fault conditions, DTC B0846 will clear automatically when battery 2 voltage range is 8.5-16.3 volts for more than 2 seconds. Current and history DTCs can be cleared using scan tool or Instrument Panel Cluster (IPC) clearing DTCs feature.

Testing

1. If diagnostic system check was performed, go to next step. If diagnostic system check has not been performed, go to «DIAGNOSTIC SYSTEM CHECK»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems__diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
2. Using scan tool, select Seat Control Module (SCM) data display. Monitor BATTERY 2 data. If 8.5-16.3 volts does not exist, go to next step. If 8.5-16.3 volts exist, go to step 4.
3. Turn ignition off. Disconnect SCM Black 6-pin connector C3. SCM is located under front of driver's seat. (Scheme 2) Using DVOM, check voltage between SCM harness connector C3 terminal "A" (Orange wire) and ground. (Scheme 3) If 8.5-16.3 volts does not exist, go to step 5. If 8.5-16.3 volts exist, go to step 7.
4. Using scan tool, check if DTC B2002, B2007 or B2012 have been stored as history. If none of these DTCs are stored as history, go to step 7. If any of these DTCs are stored as history, go to «POWER SEATS - CORVETTE»(/chevrolet/corvette/c5-1997-2004/remont/seats/#power-seat-system) article for diagnostic and repair procedures.
5. Repair open or short to ground in Orange wire between instrument panel electrical center and SCM connector C3. After repairs, go to step 9.
6. Replace SCM. See «SEAT CONTROL MODULE»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems) under REMOVAL & INSTALLATION. After repairs, go to step 9.
7. Check for intermittent malfunctions in Orange wire between instrument panel electrical center and SCM connector C3. See «WIRING DIAGRAMS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems). If problem circuit or connector is not found, go to next step. If problem circuit or connector is repaired, go to step 9.
8. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear any DTCs. Wait 2 seconds. Recheck for DTCs. If DTC B0846 does not reset as history, system is okay at this time. If DTC B0846 resets as history, go to step 6.
9. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear any DTCs. Recheck system operation. If system continues to malfunction, go to «DIAGNOSTIC SYSTEM CHECK»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems__diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.

Diagnostic Aids

1. If DTC does not reset after code is cleared, problem may be intermittent. While performing tests, move wires and connectors. Following conditions may also cause an intermittent malfunction: Intermittent open or short to ground in Orange wire circuit between instrument panel electrical center and Seat Control Module (SCM). Battery voltage is not 8.5-16.3 volts. Charging system malfunction.
2. Using scan tool, select SCM data display and monitor BATTERY 2 voltage while test driving vehicle and operating different devices (windows, door locks, power mirrors). This will determine if battery 2 voltage is affected by these devices and can help duplicate malfunction.

Scheme 2

Scheme 3

Seat Control Module (SCM) has 2 main power feeds (high and low) and one main ground. Low power feed (battery 1) is used to provide power for SCM logic and internal driver operation. High power feed (battery 2) is used to provide power for systems that draw higher amounts of current (motor, lights, etc.). For most functions, SCM will operate properly when vehicle system voltage is 9.0-16.0 volts. SCM also monitors voltage level at battery 1 and battery 2 circuits and can determine if voltage level received is out of range.

DTC B0851 will set if SCM detects battery 1 voltage range less than 8.5 volts or more than 16.3 volts for more than 2 seconds. DTC B0851 will store as a history code in SCM memory. No driver warning will be displayed. DTC can only set as history even if malfunction is current.

Under all fault conditions, DTC B0851 will clear automatically when battery 1 voltage range is between 8.5-16.3 volts for more than 2 seconds. Current and history DTCs can be cleared using scan tool or Instrument Panel Cluster (IPC) clearing DTCs feature.

1. If diagnostic system check was performed, go to next step. If diagnostic system check has not been performed, go to «DIAGNOSTIC SYSTEM CHECK»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems__diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
2. Using scan tool, select Seat Control Module (SCM) data display. Monitor BATTERY 1 data. If 8.5-16.3 volts does not exist, go to next step. If 8.5-16.3 volts exist, go to step 4.
3. Disconnect SCM connector C1. Using DVOM, check voltage between SCM harness connector C1 terminal No. 3 (Orange wire) and ground. (Scheme 4) If 8.5-16.3 volts exist, go to step 7. If 8.5-16.3 volts does not exist, go to step 5.
4. Using scan tool, check if DTC B2002, B2007 or B2012 have been stored as history. If none of these DTCs are stored as history, go to step 7. If any of these DTCs are stored as history, go to «POWER SEATS - CORVETTE»(/chevrolet/corvette/c5-1997-2004/remont/seats/#power-seat-system) article for diagnostic and repair procedures.
5. Repair open or short to ground in Orange wire between instrument panel electrical center and SCM connector C1. After repairs, go to step 9.
6. Replace SCM. See «SEAT CONTROL MODULE»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems) under REMOVAL & INSTALLATION. After repairs, go to step 9.
7. Check for intermittent malfunctions in Orange wire between instrument panel electrical center and SCM connector C1. See «WIRING DIAGRAMS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems). If problem circuit or connector is not found, go to next step. If problem circuit or connector is repaired, go to step 9.
8. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear any DTCs. Wait 2 seconds. If DTC B0851 does not reset as history, system is okay at this time. If DTC B0851 resets as history, go to step 6.
9. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear any DTCs. Recheck system operation. If system continues to malfunction, go to «DIAGNOSTIC SYSTEM CHECK»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems__diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.

1. If DTC does not reset after code is cleared, problem may be intermittent. While performing tests, move wires and connectors. Following conditions may also cause an intermittent malfunction: Intermittent open or short to ground in Orange wire circuit between instrument panel electrical center and Seat Control Module (SCM). Battery voltage is not 8.5-16.3 volts. Charging system malfunction.
2. Using scan tool, select SCM data display and monitor BATTERY 1 voltage while test driving vehicle and operating different devices (windows, door locks, power mirrors). This will determine if battery 1 voltage is affected by these devices and can help duplicate the malfunction.

Scheme 4

Seat Control Module (SCM) receives both vertical and horizontal position signals from each seat motor. These signals are used by the SCM for memory recall functions to determine vertical and horizontal position of seat. SCM commands seat memory settings based upon the voltage levels the SCM receives back from the vertical and horizontal position sensors. SCM provides 5 volt supply, a signal, and ground circuits to each position sensor. When memory setting is recalled, SCM will command seat motor in appropriate direction until vertical and horizontal position sensors are within voltage range stored in memory. SCM also monitors seat vertical and horizontal position sensor 5 volt supply circuit and can determine if voltage level received is out of range.

DTC B0856 will set when SCM detects seat vertical and horizontal position sensor supply voltage range under 4.0 volts or over 5.2 volts. Condition must be present for 2 seconds. SCM will store DTC B0856 as history. DTC can only set as history even if malfunction is current. No driver warning message will be displayed. Operation/function of seat motor is disabled until the fault is corrected.

DTC will clear when SCM detects seat vertical and horizontal position sensor supply voltage range between 4.0-5.2 volts for longer than 2 seconds. Current and history DTCs can be cleared using scan tool or Instrument Panel Cluster (IPC) clearing DTCs feature.

1. If diagnostic system check was performed, go to next step. If diagnostic system check has not been performed, go to «DIAGNOSTIC SYSTEM CHECK»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems__diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
2. Using scan tool, select SCM data display and monitor position sensor reference data. If scan tool does not indicate 4.0-5.2 volts, go to next step. If scan tool indicates 4.0-5.2 volts, go to step 9.
3. Turn ignition off. Disconnect seat adjuster motor connector C2, C3 and C4. (Scheme 5) Turn ignition on. Using DVOM, measure voltage between ground and Purple wire connector terminal of seat adjuster motor connector while moving power seat switch. If voltage is 4.0-5.2 volts, go to next step. If voltage is not 4.0-5.2 volts, go to step 5.
4. Using DVOM, measure voltage between Purple and Black wire terminals of seat adjuster motor connector while moving power seat switch. If voltage is not 4.0-5.2 volts, go to step 6. If voltage is 4.0-5.2 volts, go to step 7.
5. Check for open, short to ground or short to voltage in Purple wire between seat adjuster and SCM. If circuit is okay, go to step 8. If faulty circuit is found and repaired, go to step 11.
6. Check for open or short to voltage in Black wire between seat adjuster and SCM. If circuit is okay, go to step 8. If faulty circuit is found and repaired, go to step 11.
7. Replace the seat adjuster motor assembly. See «SEAT ADJUSTER MOTORS»(/chevrolet/corvette/c5-1997-2004/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION in POWER SEATS - CORVETTE article. After repairs, go to step 11.
8. Replace SCM. See «SEAT CONTROL MODULE»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems) under REMOVAL & INSTALLATION. After repairs, go to step 11.
9. Check seat adjuster motor position sensor circuits and connectors for intermittent malfunctions. See «WIRING DIAGRAMS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems). If problem circuit or connector is not found, go to next step. If problem circuit or connector is repaired, go to step 11.
10. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear any DTCs. Wait 2 seconds. If DTC B0856 does not reset as history, system is okay at this time. If DTC B0856 resets as history, go to step 8.
11. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear any DTCs. Recheck system operation. If system continues to malfunction, go to «DIAGNOSTIC SYSTEM CHECK»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems__diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.

The following conditions may cause an intermittent malfunction

1. Intermittent open, short to ground or short to voltage in Dark Green, Purple, Tan, Brown/White or Black wires between Seat Control Module (SCM) and seat adjuster.
2. Seat vertical or horizontal sensor is shorted internally.

If SCM is unable to determine correct vertical or horizontal position, manual power seat functions will still operate, but SCM will not be able to correctly recall position of seat when memory button is pressed. Using scan tool, select SCM data display and monitor seat position sensor data. Move power seat switch vertically and horizontally while monitoring position sensor data. This checks if the seat position sensor supply voltage is within range in different positions.

Scheme 5

DTC B2242: MEMORY NO. 1 SWITCH FAULT (LDCM)

Note. Memory switches are part of driver's door switch assembly and must be serviced as a unit.

Driver's door switch circuit provides input to Left Door Control Module (LDCM). When memory buttons No. 1 or 2 are depressed independently, or if both are depressed simultaneously, LDCM recognizes input as a memory recall request. LDCM provides power and ground to both memory switches. Ground is supplied through activated memory switch to LDCM memory select switch input. LDCM detects low voltage at memory select switch input, LDCM activates appropriate memory functions and sends a message over serial data line to other systems responsible for memory recall functions (radio, seats, etc.). LDCM monitors both memory select switch input circuits and determines how long a ground has been applied.

DTC B2242 will set if ground is applied for more than 20 seconds. DTC B2242 will store as a history code in LDCM memory. No driver warning will be displayed. DTC can only set as history even if malfunction is current.

Under all fault conditions, DTC B2242 will clear automatically when LDCM no longer detects a short to ground at memory No. 1 switch for more than 20 seconds. Current and history DTCs can be cleared using scan tool or Instrument Panel Cluster (IPC) clearing DTCs feature.

1. If diagnostic system check was performed, go to next step. If diagnostic system check has not been performed, go to «DIAGNOSTIC SYSTEM CHECK»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems__diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
2. Turn ignition on. Using scan tool, select LDCM input display and monitor MEMORY 1 SELECT SWITCH status. If scan tool displays MEMORY 1 SELECT SWITCH status as INACTIVE, go to next step. If scan tool does not display MEMORY 1 SELECT SWITCH status as INACTIVE, go to step 4 .
3. Press memory No. 1 switch button. If MEMORY 1 SELECT SWITCH status changes, go to «DIAGNOSTIC AIDS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems) . If MEMORY 1 SELECT SWITCH status does not change, go to next step.
4. Turn ignition off. Disconnect driver's door switch assembly connector. Turn ignition on and monitor MEMORY 1 SELECT SWITCH status. If scan tool display does not display MEMORY 1 SELECT SWITCH status as INACTIVE, go to next step. If scan tool displays MEMORY 1 SELECT SWITCH status as INACTIVE, go to step 7 .
5. Check for short to ground in White wire between driver's door switch assembly and LDCM. If circuit is okay, go to next step. If faulty circuit is found and repaired, go to step 10 .
6. Check LDCM circuits and connectors for intermittent malfunctions. If problem circuit or connector is not found, go to step 8 . If problem circuit or connector is found and repaired, go to step 10 .
7. Check driver's door switch circuits and connectors for intermittent malfunctions. See «WIRING DIAGRAMS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems) . If problem circuit or connector is not found, go to step 9 . If problem circuit or connector is repaired, go to step 10 .
8. Replace LDCM. See «POWER WINDOWS - CORVETTE»(/chevrolet/corvette/c5-1997-2004/remont/windows/#power-window-system) article. After repair, go to step 10 .
9. Replace driver's door switch assembly. See «DRIVER'S DOOR SWITCH ASSEMBLY»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems) under REMOVAL & INSTALLATION. After repair, go to next step.
10. Turn ignition switch to OFF position. Connect or install any connectors or components disconnected or removed. Turn ignition switch to RUN position. Clear any DTCs. Recheck system operation. If DTC resets, go to step 2 .

If DTC does not reset after code is cleared, problem may be intermittent. While performing tests, move wires and connectors. Following conditions may also cause an intermittent malfunction

1. Intermittent open or short to ground in White wire circuit between driver's door switch assembly and LDCM.
2. Memory No. 1 switch is shorted to ground internally or is sticking.
3. Memory No. 1 switch was depressed for longer than 20 seconds.

If White wire is shorted to ground or memory No. 1 switch is stuck closed, memory No. 1 selected features will operate but memory No. 2 functions will be inoperative.

DTC B2244: MEMORY NO. 2 SWITCH FAULT (LDCM)

Note. Memory switches are part of driver's door switch assembly and must be serviced as a unit.

Driver's door switch circuit provides input to Left Door Control Module (LDCM). When memory No. 1 or 2 button is depressed, LDCM recognizes input as a memory recall request. LDCM provides power and ground to both memory switches. Ground is supplied through activated memory switch to LDCM memory select switch input. LDCM detects low voltage at memory select switch input, LDCM activates appropriate memory functions and send a message over serial data line to other systems responsible for memory recall functions (radio, seats, etc.). LDCM monitors both memory select switch input circuits and determines how long a ground has been applied.

DTC B2244 will set if ground is applied for more than 20 seconds. DTC B2244 will store as a history code in LDCM memory. No driver warning will be displayed. DTC can only set as history even if malfunction is current.

Under all fault conditions, DTC B2244 will clear automatically when LDCM no longer detects a short to ground at memory No. 2 switch for more than 20 seconds. Current and history DTCs can be cleared using scan tool or Instrument Panel Cluster (IPC) clearing DTCs feature.

1. If diagnostic system check was performed, go to next step. If diagnostic system check has not been performed, go to «DIAGNOSTIC SYSTEM CHECK»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems__diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
2. Using scan tool, select LDCM data display and monitor MEMORY 2 SELECT SWITCH status. If scan tool displays MEMORY 2 SELECT SWITCH status as INACTIVE, go to next step. If scan tool does not display MEMORY 2 SELECT SWITCH status as INACTIVE, go to step 4 .
3. Press memory No. 2 switch button. If MEMORY 2 SELECT SWITCH status changes, go to «DIAGNOSTIC AIDS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems) . If MEMORY 2 SELECT SWITCH status does not change, go to next step.
4. Turn ignition off. Disconnect driver's door switch assembly connector. Turn ignition on and monitor MEMORY 2 SELECT SWITCH status. If scan tool does not display MEMORY 2 SELECT SWITCH status as INACTIVE, go to next step. If scan tool displays MEMORY 2 SELECT SWITCH status as INACTIVE, go to step 7 .
5. Check for short to ground in Purple wire between driver's door switch assembly and LDCM. If circuit is okay, go to step 8 . If faulty circuit is found and repaired, go to step 10 .
6. Check LDCM circuits and connectors for intermittent malfunctions. If problem circuit or connector is not found, go to step 8 . If problem circuit or connector is found and repaired, go to step 10 .
7. Check driver's door switch circuits and connectors for intermittent malfunctions. See «WIRING DIAGRAMS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems) . If problem circuit or connector is not found, go to step 9 . If problem circuit or connector is repaired, go to step 10 .
8. Replace LDCM. See «POWER WINDOWS - CORVETTE»(/chevrolet/corvette/c5-1997-2004/remont/windows/#power-window-system) article. After repair go to step 10 .
9. Replace driver's door switch assembly. See «DRIVER'S DOOR SWITCH ASSEMBLY»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems) under REMOVAL & INSTALLATION. After repairs, go to next step.
10. Turn ignition switch to OFF position. Connect or install any connectors or components disconnected or removed. Turn ignition switch to RUN position. Clear any DTCs. Recheck system operation. If DTC resets, go to step 2 .

If DTC does not reset after code is cleared, problem may be intermittent. While performing tests, move wires and connectors. Following conditions may also cause an intermittent malfunction

1. Intermittent open or short to ground in Purple wire circuit between driver's door switch assembly and LDCM.
2. Memory No. 2 switch is shorted to ground internally or is sticking.
3. Memory No. 2 switch was depressed for longer than 20 seconds.

If Purple wire is shorted to ground or memory No. 2 switch is stuck closed, memory No. 2 selected features will operate but memory No. 1 functions will be inoperative.

Left Door Control Module (LDCM) determines horizontal position of left mirror from a signal received from horizontal position sensor. LDCM commands mirror memory recall settings based on voltage level LDCM receives back from horizontal sensor. LDCM provides a 5-volt supply, a left-side horizontal position signal and a ground to horizontal position sensor. When a memory setting is recalled, LDCM will command left mirror motor to move to a stored position sensor voltage previously set. LDCM monitors left mirror horizontal position signal circuit and can determine if voltage level received is out of range.

DTC B2262 will set if LDCM detects left mirror horizontal position sensor signal voltage range less than 0.10 volt or more than 4.78 volts for more than 2 seconds. DTC B2262 will store as a history code in LDCM memory. No driver warning will be displayed. DTC can only set as history even if malfunction is current.

Under all fault conditions, DTC B2262 will clear automatically when LDCM no longer detects left mirror horizontal position sensor signal voltage range less than 0.10 volt or more than 4.78 volts for more than 2 seconds. Current and history DTCs can be cleared using scan tool or Instrument Panel Cluster (IPC) clearing DTCs feature.

1. If diagnostic system check was performed, go to next step. If diagnostic system check has not been performed, go to «DIAGNOSTIC SYSTEM CHECK»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems__diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
2. Turn ignition on. Using scan tool, select LDCM data display and monitor MIRROR HORIZONTAL POSITION voltage. If voltage is 0.1-4.78 volts, go to «DIAGNOSTIC AIDS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems) . If voltage is not 0.1-4.78 volts, go to next step.
3. Turn ignition off. Disconnect left mirror 4-pin connector C2. Turn ignition on. Using scan tool, monitor MIRROR HORIZONTAL POSITION voltage. If horizontal position sensor voltage is greater than 4.0 volts, go to next step. If horizontal position sensor voltage is less than 4.0 volts, go to step 8 .
4. Turn ignition off. Connect a 3-amp fused jumper wire between left mirror connector C2 terminals "C" (Black/White wire) and "D" (Gray wire). Turn ignition on. Using scan tool, monitor MIRROR HORIZONTAL POSITION voltage. If horizontal position sensor voltage is less than 0.1 volt, go to next step. If horizontal position sensor voltage is greater than 0.1 volt, go to step 9 .
5. Turn ignition off. Remove fused jumper wire. Connect a 3-amp fused jumper wire between left mirror connector C2 terminal "A" (Gray wire) and "D" (Gray wire). Turn ignition on. Using scan tool, monitor MIRROR HORIZONTAL POSITION voltage. If horizontal position sensor voltage is less than 4.0 volts, go to next step. If horizontal position sensor voltage is greater than 4.0 volts, go to step 7 .
6. Check for short to ground in Gray wire between left mirror and LDCM. If circuit is okay, go to step 12 . If faulty circuit is found and repaired, go to step 15 .
7. Check for open, short to voltage or high resistance in Gray wire between left mirror and LDCM. If circuit is okay, go to step 11 . If faulty circuit is found and repaired, go to step 15 .
8. Check for short to ground in Gray wire between left mirror and LDCM. If circuit is okay, go to step 12 . If faulty circuit is found and repaired, go to step 15 .
9. Check for open, short to voltage or high resistance in Gray wire between left mirror and LDCM. If circuit is okay, go to next step. If faulty circuit is found and repaired, go to step 15 .
10. Check for open, short to voltage or high resistance in Black/White wire between left mirror and LDCM. If circuit is okay, go to step 12 . If faulty circuit is found and repaired, go to step 15 .
11. Check left mirror circuits and connectors for intermittent malfunctions. See «WIRING DIAGRAMS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems) . If problem circuit or connector is not found, go to step 13 . If problem circuit or connector is found and repaired, go to step 15 .
12. Check LDCM circuits and connectors for intermittent malfunctions. See «WIRING DIAGRAMS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems) . If problem circuit or connector is not found, go to step 14 . If problem circuit or connector is found and repaired, go to step 15 .
13. Replace left mirror assembly. See «POWER MIRRORS - CORVETTE»(/chevrolet/corvette/c5-1997-2004/remont/mirrors/#power-mirror-system) article. After repairs, go to step 15 .
14. Replace LDCM. See «POWER WINDOWS - CORVETTE»(/chevrolet/corvette/c5-1997-2004/remont/windows/#power-window-system) article. After repairs, go to next step.
15. Turn ignition switch to OFF position. Connect or install any connectors or components that were disconnected or removed. Turn ignition switch to RUN position. Clear any DTCs. Recheck system operation. If DTC resets, go to step 2 .

If DTC does not reset after code is cleared, problem may be intermittent. While performing tests, move wires and connectors. Following conditions may also cause an intermittent malfunction

1. Intermittent open, short to voltage or short to ground in Black/White or Gray wire circuit between mirror and LDCM.
2. Left mirror horizontal position sensor is open or shorted internally.

If LDCM is unable to determine the correct horizontal position, manual power functions will still operate but LDCM will not be able to recall correct memory settings.

Right Door Control Module (RDCM) determines horizontal position of right mirror from a signal received from horizontal position sensor. RDCM commands mirror memory settings based on voltage level RDCM receives back from horizontal sensor. RDCM provides a 5-volt supply, a right-side mirror horizontal position signal and a ground to horizontal position sensor. When a memory setting is recalled, RDCM will command right mirror motor to move to a stored position sensor voltage previously set. RDCM monitors right mirror horizontal position signal circuit and can determine if voltage level received is out of range.

DTC B2263 will set if LDCM detects left mirror horizontal position sensor signal voltage range less than 0.10 volt or more than 4.78 volts for more than 2 seconds. DTC B2263 will store as a history code in RDCM memory. No driver warning will be displayed. DTC can only set as history even if malfunction is current.

Under all fault conditions, DTC B2263 will clear automatically when RDCM no longer detects right mirror horizontal position sensor signal voltage range less than 0.10 volt or more 4.78 volts for more than 2 seconds. Current and history DTCs can be cleared using scan tool or Instrument Panel Cluster (IPC) clearing DTCs feature.

1. If diagnostic system check was performed, go to next step. If diagnostic system check has not been performed, go to «DIAGNOSTIC SYSTEM CHECK»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems__diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
2. Turn ignition on. Using scan tool, select RDCM data display and monitor MIRROR HORIZONTAL POSITION voltage. If voltage is 0.1-4.78 volts, go to «DIAGNOSTIC AIDS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems). If voltage is not 0.1-4.78 volts, go to next step.
3. Turn ignition off. Disconnect right mirror 4-pin connector C2. Turn ignition on. Using scan tool, monitor MIRROR HORIZONTAL POSITION voltage. If horizontal position sensor voltage is greater than 4.0 volts, go to next step. If horizontal position sensor voltage is less than 4.0 volts, go to step 8.
4. Turn ignition off. Connect a 3-amp fused jumper wire between right mirror connector C2 terminals "C" (Black/White wire) and "D" (Light Blue/Black wire). (Scheme 6) Turn ignition on. Using scan tool, monitor MIRROR HORIZONTAL POSITION voltage. If horizontal position sensor voltage is less than 0.1 volt, go to next step. If horizontal position sensor voltage is greater than 0.1 volt, go to step 9.
5. Turn ignition off. Remove fused jumper wire. Connect a 3-amp fused jumper wire between right mirror connector C2 terminals "A" (Gray wire) and "D" (Light Blue/Black wire). Turn ignition on. Using scan tool, monitor MIRROR HORIZONTAL POSITION voltage. If horizontal position sensor voltage is less than 4.0 volts, go to next step. If horizontal position sensor voltage is greater than 4.0 volts, go to step 7.
6. Check for short to ground in Gray wire between right mirror and RDCM. If circuit is okay, go to step 12. If faulty circuit is found and repaired, go to step 15.
7. Check for open, short to voltage or high resistance in Gray wire between right mirror and RDCM. If circuit is okay, go to step 11. If faulty circuit is found and repaired, go to step 15.
8. Check for short to ground in Light Blue/Black wire between right mirror and RDCM. If circuit is okay, go to step 12. If faulty circuit is found and repaired, go to step 15.
9. Check for open, short to voltage or high resistance in Light Blue/Black wire between right mirror and RDCM. If circuit is okay, go to next step. If faulty circuit is found and repaired, go to step 15.
10. Check for open, short to voltage or high resistance in Black/White wire between right mirror and RDCM. If circuit is okay, go to step 12. If faulty circuit is found and repaired, go to step 15.
11. Check right mirror circuits and connectors for intermittent malfunctions. See «WIRING DIAGRAMS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems). If problem circuit or connector is not found, go to step 13. If problem circuit or connector is found and repaired, go to step 15.
12. Check RDCM circuits and connectors for intermittent malfunctions. See «WIRING DIAGRAMS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems). If problem circuit or connector is not found, go to step 14. If problem circuit or connector is found and repaired, go to step 15.
13. Replace right mirror assembly. See «POWER MIRRORS - CORVETTE»(/chevrolet/corvette/c5-1997-2004/remont/mirrors/#power-mirror-system) article. After repairs, go to step 15.
14. Replace RDCM. See «POWER WINDOWS - CORVETTE»(/chevrolet/corvette/c5-1997-2004/remont/windows/#power-window-system) article. After repairs, go to next step.
15. Turn ignition switch to OFF position. Connect or install any connectors or components that were disconnected or removed. Turn ignition switch to RUN position. Clear any DTCs. Recheck system operation. If DTC resets, go to step 2.

If DTC does not reset after code is cleared, problem may be intermittent. While performing tests, move wires and connectors. Following conditions may also cause an intermittent malfunction

1. Intermittent open, short to voltage or short to ground in Black/White or Gray wire circuit between mirror and RDCM.
2. Right mirror horizontal position sensor is open or shorted internally.

If RDCM is unable to determine correct horizontal position, manual power functions will still operate but RDCM will not be able to recall correct memory settings.

Scheme 6

Left Door Control Module (LDCM) determines vertical position of left mirror from a signal sent by vertical position sensor. LDCM commands mirror memory recall settings based on voltage level LDCM receives back from vertical sensor. LDCM provides a 5-volt supply, a left-side mirror vertical sensor signal and a ground to vertical position sensor. When a memory setting is recalled, LDCM will command left mirror motor to move to a stored position sensor voltage previously set. LDCM monitors left mirror vertical position signal circuit and can determine if voltage level received is out of range.

DTC B2264 will set if LDCM detects left mirror vertical position sensor signal voltage range less than 0.10 volt or more than 4.78 volts for more than 2 seconds. DTC B2264 will store as a history code in LDCM memory. No driver warning will be displayed. DTC can only set as history even if malfunction is current.

Under all fault conditions, DTC B2264 will clear automatically if LDCM no longer detects left mirror vertical position sensor signal voltage range less than 0.10 volt or more than 4.78 volts for more than 2 seconds. Current and history DTCs can be cleared using scan tool or Instrument Panel Cluster (IPC) clearing DTCs feature.

1. If diagnostic system check was performed, go to next step. If diagnostic system check has not been performed, go to «DIAGNOSTIC SYSTEM CHECK»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems__diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
2. Turn ignition on. Using scan tool, select LDCM data display and monitor MIRROR VERTICAL POSITION voltage. If voltage is 0.1-4.78 volts, go to «DIAGNOSTIC AIDS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems). If voltage is not 0.1-4.78 volts, go to next step.
3. Turn ignition off. Disconnect left mirror 4-pin connector C2. Turn ignition on. Using scan tool, monitor MIRROR VERTICAL POSITION voltage. If vertical position sensor voltage is greater than 4.0 volts, go to next step. If vertical position sensor voltage is less than 4.0 volts, go to step 8.
4. Turn ignition off. Connect a 3-amp fused jumper wire between left mirror connector C2 terminal "C" (Black/White wire) and "B" (Dark Green wire). (Scheme 6) Turn ignition on. Using scan tool, monitor MIRROR VERTICAL POSITION voltage. If vertical position sensor voltage is less than 0.1 volt, go to next step. If vertical position sensor voltage is greater than 0.1 volt, go to step 9.
5. Turn ignition off. Remove fused jumper wire. Connect a 3-amp fused jumper wire between left mirror connector C2 terminal "A" (Gray wire) and "B" (Dark Green wire). Turn ignition on. Using scan tool, monitor MIRROR VERTICAL POSITION voltage. If vertical position sensor voltage is less than 4.0 volts, go to next step. If vertical position sensor voltage is greater than 4.0 volts, go to step 7.
6. Check for short to ground in Gray wire between left mirror and LDCM. If circuit is okay, go to step 12. If faulty circuit is found and repaired, go to step 15.
7. Check for open, short to voltage or high resistance in Gray wire between left mirror and LDCM. If circuit is okay, go to step 11. If faulty circuit is found and repaired, go to step 15.
8. Check for short to ground in Dark Green wire between left mirror and LDCM. If circuit is okay, go to step 12. If faulty circuit is found and repaired, go to step 15.
9. Check for open, short to voltage or high resistance in Dark Green wire between left mirror and LDCM. If circuit is okay, go to next step. If faulty circuit is found and repaired, go to step 15.
10. Check for open, short to voltage or high resistance in Black/White wire between left mirror and LDCM. If circuit is okay, go to step 12. If faulty circuit is found and repaired, go to step 15.
11. Check left mirror circuits and connectors for intermittent malfunctions. See «WIRING DIAGRAMS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems). If problem circuit or connector is not found, go to step 13. If problem circuit or connector is found and repaired, go to step 15.
12. Check LDCM circuits and connectors for intermittent malfunctions. See «WIRING DIAGRAMS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems). If problem circuit or connector is not found, go to step 14. If problem circuit or connector is found and repaired, go to step 15.
13. Replace left mirror assembly. See «POWER MIRRORS - CORVETTE»(/chevrolet/corvette/c5-1997-2004/remont/mirrors/#power-mirror-system) article. After repairs, go to step 15.
14. Replace LDCM. See «POWER WINDOWS - CORVETTE»(/chevrolet/corvette/c5-1997-2004/remont/windows/#power-window-system) article. After repairs, go to next step.
15. Turn ignition switch to OFF position. Connect or install any connectors or components that were disconnected or removed. Turn ignition switch to RUN position. Clear any DTCs. Recheck system operation. If DTC resets, go to step 2.

If DTC does not reset after code is cleared, problem may be intermittent. While performing tests, move wires and connectors. Following conditions may also cause an intermittent malfunction

1. Intermittent open, short to voltage or short to ground in Black/White, Dark Green or Gray wire circuit between mirror and LDCM.
2. Left mirror vertical position sensor is open or shorted internally.

If LDCM is unable to determine correct vertical position, manual power functions will still operate but LDCM will not be able to recall correct memory settings.

Right Door Control Module (RDCM) determines vertical position of right mirror from a signal sent by vertical position sensor. RDCM commands mirror memory recall settings based on voltage level RDCM receives back from vertical sensor. RDCM provides a 5-volt supply, a right-side mirror vertical position signal and a ground to vertical position sensor. When a memory setting is recalled, RDCM will command right mirror motor to move to a stored position sensor voltage previously set. RDCM monitors right mirror vertical position signal circuit and can determine if voltage level received is out of range.

DTC B2265 will set if RDCM detects right mirror vertical position sensor signal voltage range less than 0.10 volt or more than 4.78 volts for more than 2 seconds. DTC B2265 will store as a history code in RDCM memory. No driver warning will be displayed. DTC can only set as history even if malfunction is current.

Under all fault conditions, DTC B2265 will clear automatically if RDCM no longer detects left mirror vertical position sensor signal voltage range less than 0.10 volt or more than 4.78 volts for more than 2 seconds. Current and history DTCs can be cleared using scan tool or IPC clearing DTCs feature.

1. If diagnostic system check was performed, go to next step. If diagnostic system check has not been performed, go to «DIAGNOSTIC SYSTEM CHECK»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems__diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
2. Turn ignition on. Using scan tool, select RDCM data display and monitor MIRROR VERTICAL POSITION voltage. If voltage is 0.1-4.78 volts, go to «DIAGNOSTIC AIDS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems). If voltage is not 0.1-4.78 volts, go to next step.
3. Turn ignition off. Disconnect right mirror 4-pin connector C2. Turn ignition on. Using scan tool, monitor MIRROR VERTICAL POSITION voltage. If vertical position sensor voltage is greater than 4.0 volts, go to next step. If vertical position sensor voltage is less than 4.0 volts, go to step 8.
4. Turn ignition off. Connect a 3-amp fused jumper wire between right mirror connector C2 terminal "C" (Black/White wire) and "B" (Brown wire). (Scheme 6) Turn ignition on. Using scan tool, monitor MIRROR VERTICAL POSITION voltage. If horizontal vertical sensor voltage is less than 0.1 volt, go to next step. If horizontal vertical sensor voltage is greater than 0.1 volt, go to step 9.
5. Turn ignition off. Remove fused jumper wire. Connect a 3-amp fused jumper wire between right mirror connector C2 terminal "A" (Gray wire) and "B" (Brown wire). Turn ignition on. Using scan tool, monitor MIRROR VERTICAL POSITION voltage. If vertical position sensor voltage is less than 4.0 volts, go to next step. If vertical position sensor voltage is greater than 4.0 volts, go to step 7.
6. Check for short to ground in Gray wire between right mirror and RDCM. If circuit is okay, go to step 12. If faulty circuit is found and repaired, go to step 15.
7. Check for open, short to voltage or high resistance in Gray wire between right mirror and RDCM. If circuit is okay, go to step 11. If faulty circuit is found and repaired, go to step 15.
8. Check for short to ground in Brown wire between right mirror and RDCM. If circuit is okay, go to step 12. If faulty circuit is found and repaired, go to step 15.
9. Check for open, short to voltage or high resistance in Brown wire between right mirror and RDCM. If circuit is okay, go to next step. If faulty circuit is found and repaired, go to step 15.
10. Check for open, short to voltage or high resistance in Black/White wire between right mirror and RDCM. If circuit is okay, go to step 12. If faulty circuit is found and repaired, go to step 15.
11. Check right mirror circuits and connectors for intermittent malfunctions. See «WIRING DIAGRAMS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems). If problem circuit or connector is not found, go to step 13. If problem circuit or connector is found and repaired, go to step 15.
12. Check RDCM circuits and connectors for intermittent malfunctions. See «WIRING DIAGRAMS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems). If problem circuit or connector is not found, go to step 14. If problem circuit or connector is found and repaired, go to step 15.
13. Replace right mirror assembly. See «POWER MIRRORS - CORVETTE»(/chevrolet/corvette/c5-1997-2004/remont/mirrors/#power-mirror-system) article. After repairs, go to step 15.
14. Replace RDCM. See «POWER WINDOWS - CORVETTE»(/chevrolet/corvette/c5-1997-2004/remont/windows/#power-window-system) article. After repairs, go to next step.
15. Turn ignition switch to OFF position. Connect or install any connectors or components that were disconnected or removed. Turn ignition switch to RUN position. Clear any DTCs. Recheck system operation. If DTC resets, go to step 2.

If DTC does not reset after code is cleared, problem may be intermittent. While performing tests, move wires and connectors. Following conditions may also cause an intermittent malfunction

1. Intermittent open, short to voltage or short to ground in Black/White, Brown or Gray wire circuit between mirror and RDCM.
2. Right mirror vertical position sensor is open or shorted internally.

If RDCM is unable to determine correct vertical position, manual power functions will still operate but RDCM will not be able to recall correct memory settings.

Memory seat functions are operated when voltages from left power seat switch are first applied to Seat Control Module (SCM). SCM then stores voltage of front vertical position sensor when either memory button is depressed. SCM provides a steady 5-volt supply (Purple wire) and ground (Black wire) to front vertical position sensor. Front vertical position sensor provides a return voltage on signal wire (Brown/White wire) to SCM. Depending on seat location, voltage on signal wire varies from 0.10-4.78 volts. When on memory recall is requested, SCM applies voltage to motor until position sensor voltage equals stored value, moving seat to preset position.

DTC B2605 will set if front vertical position sensor input to SCM is less than 0.10 volt or greater than 4.78 volts for 2 seconds or more. DTC B2605 will store as a history code in SCM memory. No driver warning will be displayed. DTC can only set as history even if malfunction is current. Memory function and operation of faulty position sensor will be disabled.

Under all fault conditions, DTC B2605 will clear automatically when front vertical position sensor to SCM is within operating range of 0.10-4.78 volts for 2 seconds or more. Current and history DTCs can be cleared using scan tool or Instrument Panel Cluster (IPC) clearing DTCs feature.

1. If diagnostic system check was performed, go to next step. If diagnostic system check has not been performed, go to «DIAGNOSTIC SYSTEM CHECK»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems__diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
2. Using scan tool, display SCM DTCs. If DTC B2605 is set as history, go to next step. If DTC B2605 is not set as history, go to step 6.
3. Using scan tool, monitor SCM data display for left seat front vertical position sensor. Attempt to operate front of left seat using power seat switch. If scan tool does not display 0.10-4.78 volts, go to next step. If scan tool displays 0.10-4.78 volts, go to step 12.
4. Turn ignition off. Disconnect left seat lower motor connector C3. Turn ignition on. Using DVOM, measure voltage between left seat lower motor connector C3 terminal "C" (Purple wire) and ground. (Scheme 7) If voltage is 4.0-5.5 volts, go to next step. If voltage is not 4.5-5.5 volts, go to step 7.
5. Measure voltage between left seat lower motor connector C3 terminals "A" (Black wire) and "C" (Purple wire). If voltage is not 4.0-5.5 volts, go to step 8. If voltage is 4.0-5.5 volts, go to step 10.
6. Turn ignition off. Disconnect left seat lower motor connector C3. Turn ignition on. Using DVOM, measure voltage between left seat motor connector C3 terminal "B" (Brown/White wire) and ground while operating front of left seat using power seat switch. If voltage is not 3.5-5.5 volts, go to step 9. If voltage is 3.5-5.5 volts, go to step 10.
7. Check for open, short to ground or short to voltage in Purple wire between left seat lower motor connector C3 and SCM connector C1. If circuit is okay, go to step 11. If faulty circuit s found and repaired, go to step 14.
8. Check for open or short to voltage in Black wire between left seat lower motor connector C3 and SCM connector C1. If circuit is okay, go to step 11. If faulty circuit s found and repaired, go to step 14.
9. Check for open, short to ground or short to voltage in Brown/White wire between left seat lower motor connector C3 and SCM connector C1. If circuit is okay, go to step 11. If faulty circuit s found and repaired, go to step 14.
10. Replace left seat adjuster motor assembly. See «POWER SEATS - CORVETTE»(/chevrolet/corvette/c5-1997-2004/remont/seats/#power-seat-system) article. After repairs, go to step 14.
11. Replace SCM. See «SEAT CONTROL MODULE»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems) under REMOVAL & INSTALLATION. After repairs, go to step 14.
12. Check left seat front vertical position sensor wiring and connectors for intermittent malfunctions. See «WIRING DIAGRAMS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems). If problem is not found, go to next step. If problem circuit or connector is repaired, go to step 14.
13. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear any DTCs. Wait 2 seconds. If DTC B2605 sets as history, go to step 11. If DTC B2605 does not set as history, system is okay at this time.
14. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear any DTCs. If DTC resets, go to «DIAGNOSTIC SYSTEM CHECK»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems__diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.

If DTC does not reset after code is cleared, problem may be intermittent. While performing tests, move wires and connectors. Following conditions may also cause an intermittent malfunction

1. Intermittent open, short to voltage or short to ground in Brown/White or Purple wire circuits between left seat lower motor and SCM.
2. An intermittent open or short to voltage in ground wire circuit (Black wire).
3. Front vertical position sensor is open or shorted internally.

If SCM is unable to determine the correct vertical position, manual power seat functions will still operate, but SCM will not be able to recall correct seat memory seat settings. Using scan tool, select SCM data display and monitor front vertical position data. Move power seat vertically in both directions while voltage range should vary and stay between 0.10-4.78 volts depending on position of seat. This will check if front vertical position sensor is shorted in different positions.

Scheme 7

Memory seat functions are operated when voltages from left power seat switch are first applied to Seat Control Module (SCM). SCM then stores voltage of rear vertical position sensor when either memory button is depressed. SCM provides a steady 5-volt supply (Purple wire) and ground (Black wire) to rear vertical position sensor. Rear vertical position sensor provides a return voltage on signal wire (Tan wire) to SCM. Depending on seat location, voltage on signal wire varies from 0.10-4.78 volts. When on memory recall is requested, SCM applies voltage to motor until position sensor voltage equals stored value, moving seat to preset position.

DTC B2606 will set if rear vertical position sensor input to SCM is less than 0.10 volt or more than 4.78 volts for 2 seconds or more. DTC B2606 will store as a history code in SCM memory. No driver warning will be displayed. DTC can only set as history even if malfunction is current. Memory function and operation of faulty position sensor will be disabled.

Under all fault conditions, DTC B2606 will clear automatically when rear vertical position sensor to SCM is within operating range of 0.10-4.78 volts for 2 seconds or more. Current and history DTCs can be cleared using scan tool or Instrument Panel Cluster (IPC) clearing DTCs feature.

1. If diagnostic system check was performed, go to next step. If diagnostic system check has not been performed, go to «DIAGNOSTIC SYSTEM CHECK»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems__diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
2. Using scan tool, display SCM DTCs. If DTC B2606 is set as history, go to next step. If DTC B2606 is not set as history, go to step 6.
3. Using scan tool, monitor SCM data display for left seat front vertical position sensor. Attempt to operate rear of left seat using power seat switch. If scan tool does not display 0.10-4.78 volts, go to next step. If scan tool displays 0.10-4.78 volts, go to step 12.
4. Turn ignition off. Disconnect left seat lower motor connector C4. Turn ignition on. Using DVOM, measure voltage between left seat lower motor connector C4 terminal "C" (Purple wire) and ground. (Scheme 7) If voltage is 4.0-5.5 volts, go to next step. If voltage is not 4.5-5.5 volts, go to step 7.
5. Measure voltage between left seat lower motor connector C4 terminals "A" (Black wire) and "C" (Purple wire). If voltage is not 4.0-5.5 volts, go to step 8. If voltage is 4.0-5.5 volts, go to step 10.
6. Turn ignition off. Disconnect left seat lower motor connector C4. Turn ignition on. Using DVOM, measure voltage between left seat motor connector C4 terminal "B" (Tan wire) and ground while operating rear of left seat using power seat switch. If voltage is not 3.5-5.5 volts, go to step 9. If voltage is 3.5-5.5 volts, go to step 10.
7. Check for open, short to ground or short to voltage in Purple wire between left seat lower motor connector C4 and SCM connector C1. If circuit is okay, go to step 11. If faulty circuit is found and repaired, go to step 14.
8. Check for open or short to voltage in Black wire between left seat lower motor connector C4 and SCM connector C1. If circuit is okay, go to step 11. If faulty circuit s found and repaired, go to step 14.
9. Check for open, short to ground or short to voltage in Tan wire between left seat lower motor connector C4 and SCM connector C1. If circuit is okay, go to step 11. If faulty circuit s found and repaired, go to step 14.
10. Replace left seat adjuster motor assembly. See «POWER SEATS - CORVETTE»(/chevrolet/corvette/c5-1997-2004/remont/seats/#power-seat-system) article. After repairs, go to step 14.
11. Replace SCM. See «SEAT CONTROL MODULE»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems) under REMOVAL & INSTALLATION. After repairs, go to step 14.
12. Check left seat rear vertical position sensor wiring and connectors for intermittent malfunctions. See «WIRING DIAGRAMS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems). If problem is not found, go to next step. If problem circuit or connector is repaired, go to step 14.
13. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear any DTCs. Wait 2 seconds. If DTC B2606 sets as history, go to step 11. If DTC B2606 does not set as history, system is okay at this time.
14. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear any DTCs. If DTC resets, go to «DIAGNOSTIC SYSTEM CHECK»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems__diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.

If DTC does not reset after code is cleared, problem may be intermittent. While performing tests, move wires and connectors. Following conditions may also cause an intermittent malfunction

1. Intermittent open, short to voltage or short to ground in Tan or Purple wire circuits between left seat lower motor and SCM.
2. An intermittent open or short to voltage in ground wire circuit (Black wire).
3. Rear vertical position sensor is open or shorted internally.

If SCM is unable to determine the correct vertical position, manual power seat functions will still operate, but SCM will not be able to recall correct seat memory seat settings. Using scan tool, select SCM data display and monitor rear vertical position data. Move power seat vertically in both directions while voltage range should vary and stay between 0.10-4.78 volts depending on position of seat. This will check if rear vertical position sensor is shorted in different positions.

Memory seat functions are operated when voltages from left power seat switch are first applied to Seat Control Module (SCM). SCM then stores voltage of horizontal position sensor when either memory button is depressed. SCM provides a steady 5-volt supply (Purple wire) and ground (Black wire) to horizontal position sensor. Horizontal position sensor provides a return voltage on signal wire (Dark Green wire) to SCM. Depending on seat location, voltage on signal wire varies from 0.10-4.78 volts. When memory recall is requested, SCM applies voltage to motor until position sensor voltage equals stored value, moving seat to preset position.

DTC B2607 will set if horizontal position sensor input to SCM is less than 0.10 volt or more than 4.78 volts for 2 seconds or more. DTC B2607 will store as a history code in SCM memory. No driver warning will be displayed. DTC can only set as history even if malfunction is current. Memory function and operation of faulty position sensor will be disabled.

Under all fault conditions, DTC B2607 will clear automatically when horizontal position sensor to SCM is within operating range of 0.10-4.78 volts for 2 seconds or more. Current and history DTCs can be cleared using scan tool or IPC clearing DTCs feature.

1. If diagnostic system check was performed, go to next step. If diagnostic system check has not been performed, go to «DIAGNOSTIC SYSTEM CHECK»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems__diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
2. Using scan tool, display SCM DTCs. If DTC B2607 is set as history, go to next step. If DTC B2607 is not set as history, go to step 6.
3. Using scan tool, monitor SCM data display for left seat front vertical position sensor. Attempt to operate seat forward and rearward using power seat switch. If scan tool does not display 0.10-4.78 volts, go to next step. If scan tool displays 0.10-4.78 volts, go to step 12.
4. Turn ignition off. Disconnect left seat lower motor connector C2. Turn ignition on. Using DVOM, measure voltage between left seat lower motor connector C2 terminal "A" (Purple wire) and ground. (Scheme 7) If voltage is 4.0-5.5 volts, go to next step. If voltage is not 4.5-5.5 volts, go to step 7.
5. Measure voltage between left seat lower motor connector C2 terminals "A" (Purple wire) and "C" (Black wire). If voltage is not 4.0-5.5 volts, go to step 8. If voltage is 4.0-5.5 volts, go to step 10.
6. Turn ignition off. Disconnect left seat lower motor connector C2. Turn ignition on. Using DVOM, measure voltage between left seat motor connector C2 terminal "B" (Dark Green wire) and ground while operating seat forward and rearward using power seat switch. If voltage is not 3.5-5.5 volts, go to step 9. If voltage is 3.5-5.5 volts, go to step 10.
7. Check for open, short to ground or short to voltage in Purple wire between left seat lower motor connector C2 and SCM connector C1. If circuit is okay, go to step 11. If faulty circuit is found and repaired, go to step 14.
8. Check for open or short to voltage in Black wire between left seat lower motor connector C2 and SCM connector C1. If circuit is okay, go to step 11. If faulty circuit is found and repaired, go to step 14.
9. Check for open, short to ground or short to voltage in Dark Green wire between left seat lower motor connector C2 and SCM connector C1. If circuit is okay, go to step 11. If faulty circuit is found and repaired, go to step 14.
10. Replace left seat adjuster motor assembly. See «POWER SEATS - CORVETTE»(/chevrolet/corvette/c5-1997-2004/remont/seats/#power-seat-system) article. After repairs, go to step 14.
11. Replace SCM. See «SEAT CONTROL MODULE»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems) under REMOVAL & INSTALLATION. After repairs, go to step 14.
12. Check left seat horizontal position sensor wiring and connectors for intermittent malfunctions. See «WIRING DIAGRAMS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems). If problem is not found, go to next step. If problem circuit or connector is repaired, go to step 14.
13. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear any DTCs. Wait 2 seconds. If DTC B2607 sets as history, go to step 11. If DTC B2607 does not set as history, system is okay at this time.
14. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear any DTCs. If DTC resets, go to «DIAGNOSTIC SYSTEM CHECK»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems__diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.

If DTC does not reset after code is cleared, problem may be intermittent. While performing tests, move wires and connectors. Following conditions may also cause an intermittent malfunction

1. Intermittent open or short to ground in Dark Green or Purple wire circuits between left seat lower motor and SCM.
2. An intermittent open, short to voltage or short to ground in ground wire circuit (Black wire).
3. Horizontal position sensor is open or shorted internally.

If SCM is unable to determine correct horizontal position, manual power seat functions will still operate, but SCM will not be able to recall correct seat memory seat settings. Using scan tool, select SCM data display and monitor horizontal position data. Move power seat horizontally in both directions while voltage range should vary and stay between 0.10-4.78 volts depending on position of seat. This will check if horizontal position sensor is shorted in different positions.

Seat Control Module (SCM) measures and stores steering column telescopic position using a position sensor. This position sensor is part of the telescoping actuator. Steering column position is stored in SCM. SCM provides a steady 5-volt supply (Purple wire) and ground (Black wire) to horizontal position sensor. Horizontal position sensor provides a return voltage on signal wire (White wire) to SCM. Depending on column location, voltage on signal wire varies from 0.10-4.78 volts. When memory recall is requested, SCM applies voltage to motor until position sensor voltage equals stored value, moving steering column to preset position.

DTC B2860 will set if position sensor input to SCM is less than 0.10 volt or more than 4.78 volts for 2 seconds or more. DTC B2860 will store as a history code in SCM memory. No driver warning will be displayed. DTC can only set as history even if malfunction is current. Memory function and operation of faulty position sensor will be disabled.

Under all fault conditions, DTC B2860 will clear automatically when position sensor to SCM is within operating range of 0.10-4.78 volts for 2 seconds or more. Current and history DTCs can be cleared using scan tool or IPC clearing DTCs feature.

1. If diagnostic system check was performed, go to next step. If diagnostic system check has not been performed, go to «DIAGNOSTIC SYSTEM CHECK»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems__diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
2. Using scan tool, display SCM DTCs. If DTC B2860 is set as history, go to next step. If DTC B2860 is not set as history, go to step 6 .
3. Using scan tool, monitor SCM data display for telescoping steering column position sensor. Attempt to operate steering column using switch. If scan tool does not display 0.10-4.78 volts, go to next step. If scan tool displays 0.10-4.78 volts, go to step 12 .
4. Turn ignition off. Disconnect steering column actuator 3-pin connector. Turn ignition on. Using DVOM, measure voltage between steering column actuator connector terminal "A" (Purple wire) and ground while operating steering column in and out using switch. If voltage is 4.0-5.5 volts, go to next step. If voltage is not 4.5-5.5 volts, go to step 7 .
5. Measure voltage between steering column actuator 3-pin connector terminals "A" (Purple wire) and "B" (Black wire) while operating steering column in and out using switch. If voltage is not 4.0-5.5 volts, go to step 8 . If voltage is 4.0-5.5 volts, go to step 10 .
6. Turn ignition off. Disconnect steering column actuator 3-pin connector. Turn ignition on. Using DVOM, measure voltage between steering column actuator connector terminal "C" (White wire) and ground while operating steering column in and out using switch. If voltage is not 3.5-5.5 volts, go to step 9 . If voltage is 3.5-5.5 volts, go to step 10 .
7. Check for open, short to ground or short to voltage in 5 volt supply circuit between steering column actuator connector and SCM connector C1. See «WIRING DIAGRAMS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems) . If circuit is okay, go to step 11 . If faulty circuit is found and repaired, go to step 14 .
8. Check for open or short to voltage in sensor ground circuit between steering column actuator connector and SCM connector C1. See «WIRING DIAGRAMS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems) . If circuit is okay, go to step 11 . If faulty circuit is found and repaired, go to step 14 .
9. Check for open, short to ground or short to voltage in White wire between steering column actuator connector and SCM connector C1. If circuit is okay, go to step 11 . If faulty circuit is found and repaired, go to step 14 .
10. Replace telescoping actuator assembly. See «STEERING COLUMN SWITCHES - CORVETTE»(ref-4420) article. After repairs, go to step 14 .
11. Replace SCM. See «SEAT CONTROL MODULE»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems) under REMOVAL & INSTALLATION. After repairs, go to step 14 .
12. Check steering column actuator position sensor wiring and connectors for intermittent malfunctions. See «WIRING DIAGRAMS»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems) . If problem is not found, go to next step. If problem circuit or connector is repaired, go to step 14 .
13. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear any DTCs. Wait 2 seconds. If DTC B2860 sets as history, go to step 11 . If DTC B2860 does not set as history, system is okay at this time.
14. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear any DTCs. If DTC resets, go to «DIAGNOSTIC SYSTEM CHECK»(/chevrolet/corvette/c5-1997-2004/remont/entertainment-systems/#memory-systems__diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.

If DTC does not reset after code is cleared, problem may be intermittent. While performing tests, move wires and connectors. Following conditions may also cause an intermittent malfunction

1. Intermittent open, short to ground or short to voltage in White or Purple wire circuits between steering column motor and SCM.
2. An intermittent open, short to ground or short to voltage in ground wire circuit (Black wire).
3. Position sensor is open or shorted internally.

If SCM is unable to determine correct horizontal position, manual steering column functions will still operate, but SCM will not be able to recall correct column memory settings. Using scan tool, select SCM data display and monitor horizontal position data. Move power telescoping steering column in both directions. Voltage range should vary and stay between 0.10-4.78 volts depending on position of column. This will check if position sensor is shorted in different positions.

REMOVAL & INSTALLATION

Note. For additional removal and installation procedures, see appropriate POWER SEATS , POWER MIRRORS or STEERING COLUMN SWITCHES article.

Memory switches, power mirror switches, power door lock switches and power window switches are replaced as an assembly. Disconnect negative battery cable. Pry up rear edge of door switch assembly using small, flat-blade screwdriver to release retainer. Slide switch assembly rearward. Disconnect harness connector. To install, reverse removal procedure.

Remove front seat. See POWER SEAT under REMOVAL & INSTALLATION in POWER SEATS - CORVETTE article. Position seat to access underside of lower seat cushion. Remove retainers attaching module to seat foam support wires. (Scheme 8) Disconnect seat control module connectors. To install, reverse removal procedure.

Scheme 8

Memory Steering Column Wiring Diagram (Corvette). Scheme 9

Memory Seats/Mirrors Wiring Diagram (Corvette). Scheme 10

See also:
• POWER MIRRORS - CORVETTE
• POWER SEATS - CORVETTE
• STEERING COLUMN SWITCHES - CORVETTE
• ANALOG INSTRUMENT PANELS - CORVETTE
• SCAN TOOL DOES NOT POWER UP
• SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE
• BODY CONTROL MODULE DIAGNOSTIC SYSTEM CHECK
• POWER WINDOWS - CORVETTE
• WIRING DIAGRAMS
• B2242
• B2244
• DIAGNOSTIC SYSTEM CHECK