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Home >> Mercedes Benz >> 1993 >> 300SL Automatic >> Repair and Diagnosis >> Body & Frame >> Sun Roof/T-Top/Convertible Top >> Power Convertible Soft/Hard Tops & Roll Bar - 300SL, 500SL & 600SL >> Symptoms (Section 13) >> Soft/Hard Top - Symptom Diagnostic Table

Soft/Hard Top - Symptom Diagnostic Table

A symptom can also be referred to as a complaint, certain functions are not operating properly. For complaint related diagnostics, perform appropriate symptom test when directed to do so from table.

SOFT/HARD TOP SYMPTOM DIAGNOSTICS

Symptom/Problem Possible Causes (1)(2) Section/Test Step/Remedy
(No. 1) Hardtop Does Not Lock Or Unlock.
- - - - RST/RB Hydraulic Unit (A7/5) Does Not Run. Section 23.1, Tests 1.0, 2.0 & 3.0, See Figure
- - - - Rear Locks Valve (Y56y2) Section 23.1, Tests 40.0 & 41.0, See Figure
- - - - Front Locks Valve (Y56y4) Section 23.1, Tests 44.0 & 45.0, See Figure
- - - - Insufficient System Pressure (Nominal Value) Section 33.1, Test 1.0, See Figure
- - - - Latch Pins On The Hardtop Poorly Adjusted. (3) Check adjustment
(No. 2) Indicator Lamp In The Power Soft Top Switch Does Not Come On When The Ignition Is Turned On.
- - - - Voltage Supply, Circuits 15 & 31. Section 23.1, Test 2.0, See Figure
- - - - Power Soft Top Switch (S84). Section 23.1, Test 23.0, See Figure
- - - - Power Soft Top Control Module (N52) Defective. (4) Section 23.1, Test 37.0, See Figure
(No. 3) Indicator Lamp In The Power Soft Top Switch Comes On With The Soft Top Locked.
(6)
- - - - Left Bow "Locked" Switch (A22S2). Section 23.1, Test 8.0, See Figure
- - - - Right Bow "Locked" Switch (A23S2). Section 23.1, Test 9.0, See Figure
- - - - Left Front Soft Top "Locked" Switch (S84/1). Section 23.1, Test 12.0, See Figure
- - - - Right Front Soft Top "Locked" Switch (S84/2). Section 23.1, Test 13.0, See Figure
(No. 4) Indicator Lamp In The Power Soft Top Switch Comes On With The Soft Top Open.
(6)
- - - - Left Cover "Locked" Switch (A24S2). Section 23.1, Test 4.0, See Figure
- - - - Right Cover "Locked" Switch (A25S2). Section 23.1, Test 5.0, See Figure
- - - - Soft Top "Raised" Switch (S84/4). Section 23.1, Test 17.0, See Figure
(No. 5) Roll Bar Cannot Be Raised With Roll Bar Switch (S83).
- - - - RST/RB Hydraulic Unit (A7/5) Does Not Run. Section 23.1 Tests 1.0, 2.0, & 3.0, See Figure
- - - - Roll Bar Switch (S83). Section 23.1, Test 24.0, See Figure
- - - - Insufficient System Pressure (Nominal Value). Section 33.1, Test 1.0, See Figure
- - - - Check All Hydraulic Connections For Leaks. Section 33.1, Test 5.0, See Figure
- - - - Test Hydraulic Circuit, Raising Roll Bar. Section 33.1, Test 4.0, See Figure
(No. 6) Roll Bar Cannot Be Raised With Power Soft Top Switch (S84).
(7)
- - - - Piston Side Valve (Y57Y11) Insufficient System Pressure (Nominal Value). Section 23.1, Tests 58.0 & 59.0, See Figure
- - - - Insufficient System Pressure (Nominal Value). Section 33.1, Test 1.0, See Figure
- - - - Check All Hydraulic Connections For Leaks. Section 33.1, Test 5.0, See Figure
- - - - Test Hydraulic Circuit, Raising Roll Bar. Section 33.1, Test 4.0, See Figure
(No. 7) Roll Bar Cannot Be Lowered Using The Roll Bar Switch (S83).
- - - - Roll Bar Was Automatically Deployed (Crash Deployment).
(8)		 Section 23.1 Tests 1.0, 2.0 & 3.0, See Figure
- - - - Roll Bar switch (S83). Section 23.1, Test 24.0, See Figure
- - - - Rod Side Valve (Y57Y10). Section 23.1, Tests 56.0 & 57.0, See Figure
- - - - Piston Side Valve (Y57Y11) Section 23.1, Tests 58.0 & 59.0, See Figure
- - - - Insufficient System Pressure (Nominal Value). Section 33.1, Test 1.0, See Figure
- - - - Check All Hydraulic Connections For Leaks. Section 33.1, Test 5.0, See Figure
- - - - Test Hydraulic Circuit, Lower Roll Bar. Section 33.1, Test 3.0, See Figure
(No. 8) Roll Bar Cannot Be Lowered Using The Power Soft Top Switch (S84).
- - - - RST/RB Hydraulic Unit (A7/5) Does Not Run. Section 23.1, Tests 1.0, 2.0 & 3.0, See Figure
- - - - Power Soft Top Switch (S84). Section 23.1, Test 23.0, See Figure
- - - - Rod Side Valve (Y57Y10). Section 23.1, Tests 56.0 & 57.0, See Figure
- - - - Piston Side Valve (Y57Y11). Section 23.1,, Tests 58.0 & 59.0, See Figure
- - - - Insufficient System Pressure (Nominal Value). Section 33.1, Test 1.0. See Figure
- - - - Check All Hydraulic Connections For Leaks. Section 33.1, Test 5.0, See Figure
- - - - Test Hydraulic Circuit, Lower Roll Bar. Section 33.1, Test 3.0, See Figure
(No. 9) Roll Bar Raises By Itself (Not A Crash Deployment).
- - - - Roll Bar Activator (Right) Defective. (5)
(No. 10) During A Soft Top Closing Operation: Soft Top Compartment Cover Does Not Unlock.
- - - - RST/RB Hydraulic Unit (A7/5) Does Not Run. Section 23.1, Tests 1.0, 2.0 & 3.0, See Figure
- - - - Roll Bar "Retracted" Switch (S83/1). Section 23.1, Test 18.0, See Figure
- - - - Soft Top "Open" Switch (Soft Top In Storage Compartment - S84/3). Section 23.1, Test 16.0, See Figure
- - - - Power Soft Top Switch (S84). Section 23.1, Test 23.0, See Figure
- - - - Center Locks Valve (Y56Y3). Section 23.1, Tests 42.0 & 4.3.0, See Figure
- - - - Insufficient System Pressure (Nominal Value). Section 33.1, Test 1.0, See Figure
- - - - Check All Hydraulic Connections For Leaks. Section 33.1, Test 5.0, See Figure
- - - - Test Hydraulic Circuit, Opening The Center Locks. Section 33.1, Test 8.0, See Figure
(No. 11) Soft Top Compartment Cover Does Not Open Or Raises Only Slowly.
- - - - Left Cover "Locked" Switch (A24S2). Section 23.1, Test 4.0, See Figure
- - - - Right Cover "Locked" Switch (A25S2). Section 23.1, Test 5.0, See Figure
- - - - Soft Top Compartment Cover Valve (Y56Y5). Section 23.1, Tests 46.0 & 47.0, See Figure
- - - - Insufficient System Pressure (Nominal Value). Section 33.1, Test 1.0, See Figure
- - - - Check All Hydraulic Connections For Leaks. Section 33.1, Test 5.0, See Figure
- - - - Test Hydraulic Circuit, Raising The Soft Top Compartment Cover. Section 33.1, Test 9.0, See Figure
(No. 12) Soft Top Compartment Cover Opens & Closes.
- - - - Left Cover "Closed" Switch (A24S1). Section 23.1, Test 6.0, See Figure
- - - - Right Cover "Closed" Switch (A25S1). Section 23.1, Test 7.0, See Figure
(No. 13) Soft Top Does Not Come Out Of Compartment Or Closes Very Slowly.
- - - - Soft Top Compartment "Open" Switch (S84/5). Section 23.1, Test 14.0, See Figure
- - - - Soft Top Fabric Bow "Raised" Switch (S84/6). Section 23.1, Test 15.0, See Figure
- - - - Soft Top "Close" Valve (Y55Y7). Section 23.1, Tests 50.0 & 51.0 See Figure
- - - - Fabric Bow "Raise" Valve (Y55Y8) Section 23.1, Test 53.0, See Figure
- - - - Insufficient System Pressure (Nominal Value). Section 33.1, Test 1.0, See Figure
- - - - Check All Hydraulic Connections For Leaks. Section 33.1, Test 5.0, See Figure
- - - - Test Hydraulic Circuit, Soft Top Closing. Section 34.1, Test 3.0, See Figure
(No. 14) Soft Top Remains In 90° Position.
- - - - Left Front Door "Window Down" Limit Switch (S21/9). Section 23.1, Test 19.0, See Figure
- - - - Right Front Door "Window Down" Limit Switch (S21/8). Section 23.1, Test 20.0, See Figure
(No. 15) Front Latches Of Soft Top Do Not Lock.
- - - - Soft Top "Raised" Switch (S84/4). Section 23.1, Test 17.0, See Figure
- - - - Left Front Soft Top "Locked" Switch (S84/1). Section 23.1, Test 12.0, See Figure
- - - - Right Front Soft Top "Locked" Switch (S84/2). Section 23.1, Test 13.0, See Figure
- - - - Front Locks Valve (Y56Y4). Section 23.1, Tests 44.0 & 45.0, See Figure
- - - - Insufficient System Pressure (Nominal Value). Section 33.1, Test 1.0, See Figure
- - - - Check All Hydraulic Connections For Leaks. Section 33.1, Test 5.0, See Figure
- - - - Check Hydraulic Circuit, Locking Front Latches. Section 34.1, Test 4.0, See Figure
- - - - Latch Pins Poorly Adjusted At The Soft Top Front Latches. (9)
(No. 16) Soft Top Compartment Does Not Close Or Closes Slowly Or Does Not Lock.
- - - - Left Front Soft Top "Locked" Switch (S84/1) Section 23.1, Test 12.0, See Figure
- - - - Right Front Soft Top "Locked" Switch (S84/2) Section 23.1, Test 13.0, See Figure
- - - - Soft Top Fabric Bow "Raised" Switch (S84/6) Section 23.1, Test 15.0, See Figure
- - - - Soft Top Compartment Cover Valve (Y56Y5) Section 23.1, Tests 46.0 & 47.0, See Figure
- - - - Insufficient System Pressure (Nominal Value). Section 33.1, Test 1.0, See Figure
- - - - Check All Hydraulic Connections For Leaks. Section 33.1, Test 5.0, See Figure
- - - - Test Hydraulic Circuit, Soft Top Compartment Cover Closing. Section 33.1, Test 12.0, See Figure
(No. 17) Soft Top Compartment Cover Does Not Lock.
- - - - Left Cover "Closed" Switch (A24S1). Section 23.1, Test 6.0, See Figure
- - - - Right Cover "Closed" Switch (A25S1). Section 23.1, Test 7.0, See Figure
- - - - Soft Top Compartment Cover Valve (Y56Y5). Section 23.1, Tests 46.0 & 47.0, See Figure
- - - - Insufficient System Pressure (Nominal Value). Section 33.1, Test 1.0, See Figure
- - - - Check All Hydraulic Connections For Leaks. Section 33.1, Test 5.0, See Figure
- - - - Test Hydraulic Circuit, Soft Top Compartment Cover Closing. Section 33.1, Test 12.0, See Figure
(No. 18) Fabric Bow Does Not Move Or Moves Down Only Slowly.
- - - - Left Cover "Locked" Switch (A24S2). Section 23.1, Test 4.0, See Figure
- - - - Right Cover "Locked" Switch (A25S2). Section 23.1, Test 5.0, See Figure
- - - - Fabric Bow "Raise" Valve (Y55Y8). Section 23.1, Tests 52.0 & 53.0, See Figure
- - - - Fabric Bow "Lower" Valve (Y55Y9). Section 23.1, Test 54.0 & 55.0, See Figure
- - - - Insufficient System Pressure (Nominal Value). Section 33.1, Test 1.0, See Figure
- - - - Check All Hydraulic Connections For Leaks. Section 33.1, Test 5.0, See Figure
- - - - Test Hydraulic Circuit, Lowering Fabric Bow. Section 33.1 Test 6.0, See Figure
(No. 19) Rear Locks Do Not Lock.
- - - - Left Bow "Closed" Switch (A22S1). Section 23.1, Test 10.0, See Figure
- - - - Right Bow "Closed" Switch (A23S1). Section 23.1, Test 11.0, See Figure
- - - - Soft Top "Close" Valve (Y55Y7). Section 23.1, Tests 50.0 & 51.0, See Figure
- - - - Rear Locks Valve (Y56Y2) Section 23.1, Tests 40.0 & 41.0, See Figure
- - - - Insufficient System Pressure (Nominal Value). Section 33.1 Test 1.0, See Figure
- - - - Check All Hydraulic Connections For Leaks. Section 33.1 Test 5.0, See Figure
- - - - Test Hydraulic Circuit, Locking Rear Locks. Section 33.1 Test 7.0, See Figure
(No. 20) During Soft Top Opening: Rear Locks Do Not Unlock.
- - - - Roll Bar "Retracted" Switch (S83/1). (10)
Section 23.1, Test 18.0, See Figure
- - - - Soft Top "Open" Switch (Soft Top In Storage Compartment S84/3). Section 23.1, Test 16.0, See Figure
- - - - Roll Bar Switch (S83). Section 23.1, Test 23.0, See Figure
- - - - Rear Locks Valve (Y56Y2). Section 23.1, Test 40.0 & 41.0, See Figure
- - - - Insufficient System Pressure (Nominal Value). Section 33.1 Test 1.0, See Figure
- - - - Check All Hydraulic Connections For Leaks. Section 33.1 Test 5.0, See Figure
- - - - Test Hydraulic Circuit, Open Rear Locks. Section 33.1 Test 6.0, See Figure
(No. 21) Fabric Bow Does Not Move Or Moves Only Slowly Up.
- - - - Left Bow "Locked" Switch (A22S2). Section 23.1, Test 8.0, See Figure
- - - - Right Bow "Locked" Switch (A23S2). Section 23.1, Test 9.0, See Figure
- - - - Fabric Bow "Raise" Valve (Y55Y8). Section 23.1, Test 52.0 & 53.0, See Figure
- - - - Insufficient System Pressure (Nominal Value). Section 33.1, Test 1.0, See Figure
- - - - Check All Hydraulic Connections For Leaks. Section 33.1, Test 5.0, See Figure
- - - - Test Hydraulic Circuit, Raise Fabric Bow. Section 33.1, Test 7.0, See Figure
(No. 22) Fabric Bow Goes Up & Down.
- - - - Left Bow "Closed" Switch (A22S1) Section 23.1, Test 10.0, See Figure
- - - - Right Bow "Closed" Switch (A23S1). Section 23.1, Test 11.0, See Figure
(No. 23) Center Locks Do Not Unlock.
- - - - Soft Top Fabric Bow "Raised" Switch (S84/6). Section 23.1, Test 15.0, See Figure
- - - - Center Locks Valve (Y56Y3). Section 23.1, Test 42.0 & 43.0, See Figure
- - - - Insufficient System Pressure (Nominal Value). Section 33.1, Test 1.0, See Figure
- - - - Check All Hydraulic Connections For Leaks. Section 33.1, Test 5.0, See Figure
- - - - Test Hydraulic Circuit, Open Center Locks Section 33.1, Test 8.0, See Figure
(No. 24) Soft Top Compartment Cover Does Not Open Or Opens Only Slowly.
- - - - Left Cover "Locked" Switch (A24S2). Section 23.1, Test 4.0, See Figure
- - - - Right Soft Top Compartment Cover "Locked" Switch (A25S2). Section 23.1, Test 5.0 & 46.0, See Figure & Figure
- - - - Soft Top Compartment Cover Valve (Y56Y5). Section 23.1, Test 47.0, See Figure
- - - - Insufficient System Pressure (Nominal Value). Section 33.1, Test 1.0, See Figure
- - - - Check All Hydraulic Connections For Leaks. Section 33.1, Test 5.0, See Figure
- - - - Test Hydraulic Circuit, Raise Soft Top Compartment Cover. Section 33.1, Test 9.0, See Figure
(No. 25) Soft Top Compartment Cover Opens & Closes.
- - - - Left Cover "Closed" Switch (A24S1). Section 23.1, Test 6.0, See Figure
- - - - Right Cover "Closed" Switch (A25S1). Section 23.1, Test 7.0, See Figure
(No. 26) Front Locks Do Not Unlock.
- - - - Soft Top Compartment "Open" Switch (S84/5). Section 23.1, Test 14.0, See Figure
- - - - Left Front Door "Window Down" Limit Switch (S21/9). Section 23.1, Test 19.0, See Figure
- - - - Right Front Door "Window Down" Limit Switch (S21/8). Section 23.1, Test 20.0, See Figure
- - - - Front Locks Valve (Y56Y4). Section 23.1, Test 44.0 & 45.0, See Figure
- - - - Insufficient System Pressure (Nominal Value). Section 33.1, Test 1.0, See Figure
- - - - Check All Hydraulic Connections For Leaks. Section 33.1, Test 5.0, See Figure
- - - - Test Hydraulic Circuit, Open Front Locks. Section 33.1, Test 10.0, See Figure
(No. 27) Soft Top Does Not Open Or Opens Only Slowly.
- - - - Left Front Soft Top "Locked" Switch (S84/1) Section 23.1, Test 12.0, See Figure
- - - - Right Front Soft Top "Locked" Switch (S84/2). Section 23.1, Test 13.0, See Figure
- - - - Soft Top "Open" Valve (Y55Y6). Section 23.1, Test 48.0 & 49.0, See Figure
- - - - Insufficient System Pressure (Nominal Value). Section 33.1, Test 1.0, See Figure
- - - - Check All Hydraulic Connections For Leaks. Section 33.1, Test 5.0, See Figure
- - - - Test Hydraulic Circuit, Open Soft Top. Section 33.1, Test 11.0, See Figure
(No. 28) Soft Top Compartment Cover Does Not Close Or Closes Only Slowly.
- - - - Soft Top "Open" Switch (Soft Top In Storage Compartment) (S84/3). Section 23.1, Test 16.0, See Figure
- - - - Soft Top Compartment Cover Valve (Y56Y5). Section 23.1, Test 46.0 & 47.0, See Figure
- - - - Insufficient System Pressure (Nominal Value). Section 33.1, Test 1.0, See Figure
- - - - Check All Hydraulic Connections For Leaks. Section 33.1, Test 5.0, See Figure
- - - - Test Hydraulic Circuit, Close Soft Top Compartment Cover. Section 33.1, Test 12.0, See Figure
(No. 29) Center Locks Do Not Lock.
- - - - Left Cover "Closed" Switch (A24S1). Section 23.1, Test 6.0, See Figure
- - - - Right Cover "Closed" Switch (A25S1). Section 23.1, Test 7.0, See Figure
- - - - Center Locks Valve (Y56Y3). Section 23.1, Tests 42.0 & 43.0, See Figure
- - - - Insufficient System Pressure (Nominal Value). Section 33.1, Test 1.0, See Figure
- - - - Check All Hydraulic Connections For Leaks. Section 33.1, Test 5.0, See Figure
- - - - Test Hydraulic Circuit, Open Center Locks. (11) SECTION 34
(No. 30) Side Windows Do Not Open Using The Power Soft Top Switch, But Do Open With The Power Window Switches.
- - - - Power Soft Top Control Module (N52). (4)
- - - - Left Front Door "Window Down" Limit Switch (S21/9). Section 23.1, Test 19.0, See Figure
- - - - Right Front Door "Window Down" Limit Switch (S21/8). Section 23.1, Test 20.0, See Figure
(No. 31) Side Windows Do Not Close Or Open Using The Power Window Switches (First Detent Only).
- - - - Left Front Power Window Switches (S21/1). Section 23.1, Test 33.0, See Figure
- - - - Right Front Power Window Switches (S21/2). Section 23.1, Test 34.0, See Figure
- - - - Left Front Power Window Motor (M10/3). Section 23.1, Test 35.0, See Figure
- - - - Right Front Power Window Motor (M10/4). Section 23.1, Test 36.0, See Figure
- - - - Power Soft Top Control Module (N52). (4)
(No. 31 Continued) Or, If Using One Touch Opening (Second Detent).
- - - - Left Front Door "Window Down" Limit Switch (S21/9) Section 23.1, Test 19.0, See Figure
- - - - Right Front Door "Window Down" Limit Switch (S21/8) Section 23.1, Test 20.0, See Figure
(No. 32) Side Window Closing Convenience Feature Does Not Work.
(12)
- - - - Left Door ATA/CF Microswitch (S86). Section 23.1, Test 60.0, See Figure
- - - - Right Door ATA/CF Microswitch (S87S1). Section 23.1, Test 60.0, See Figure
- - - - Trunk Lid ATA/CF Microswitch (S88S1). Section 23.1, Test 60.0, See Figure
- - - - Left Door Actuator (S47). Section 23.1, Test 61.0, See Figure
- - - - Right Door Actuator (S48). Section 23.1, Test 61.0, See Figure
- - - - Trunk Lid Lock Actuator (S49). Section 23.1, Test 61.0, See Figure
- - - - Power Soft Top Control Module (N52). (4)
(1) Before proceeding with indicated test/step(s), it is essential that PREPARATION FOR TESTING is observed. See PREPARATION FOR TESTING  . For test equipment hook up. See CONNECTING ELECTRICAL TEST EQUIPMENT  under ELECTRICAL DIAGNOSTIC TESTS (SECTION 23). Failure to properly connect test equipment may lead to incorrect diagnosis or personal injury.
(2) Observe Warnings, Cautions and Notes before test steps are performed. Return to SYMPTOM DIAGNOSTIC table and continue to indicated test/step(s).
(3) See HARD TOP ADJUSTMENTS  under ADJUSTMENTS.
(4) Replace top actuation control module. See TOP ACTUATION CONTROL UNIT (N52)  under REMOVAL & INSTALLATION.
(5) Observe Warnings, Cautions and Notes under ROLL BAR ASSEMBLY. Check adjustments. See ADJUSTMENT  under ROLL BAR ASSEMBLY.
(6) No DTC displayed, gong sounds while driving.
(7) Only possible during the soft top up or down sequence, roll bar must have been raised previously.
(8) Raise roll bar using Roll Bar switch (S83) until a re-engagement click is heard on passenger side.
(9) See SOFT TOP ADJUSTMENTS  under ADJUSTMENTS.
(10) Readout impulse counter (DTC).
(11) See HYDRAULIC TEST PROGRAM - TEST SOFT TOP UP (SECTION 34)  under HYDRAULIC DIAGNOSTIC TESTS (SECTION 32).
(12) At driver/passenger door lock or at trunk lock).
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