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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 >> Self-Diagnostic System (Section 12) >> Diagnostic Trouble Code Definitions (Section 12/1)

Diagnostic Trouble Code Definitions (Section 12/1)

NOTE: For aid in using diagnostic charts, see USING DIAGNOSTIC CHARTS  .
SOFT/HARD TOP DIAGNOSTIC TROUBLE CODE DEFINITIONS

Hand Held Tester (Code) (1) Component Or System (2) Test Step/Remedy
1 No Fault In System ---
2 Left Cover "Locked" Switch (A24S2) Section 23.1, Test 4.0, See Figure
3 Right Cover "Locked" Switch (A25s2) Section 23.1, Test 5.0, See Figure
4 Left Cover "Closed" Switch (A24S1) Section 23.1, Test 6.0, See Figure
5 Cover "Closed" Switch (A25S1) Section 23.1, Test 7.0, See Figure
6 Left Bow "Locked" Switch (A22S2) Section 23.1, Test 8.0, See Figure
7 Right Bow "Locked" Switch (A23S2) Section 23.1, Test 9.0, See Figure
8 Left Bow "Closed" Switch (A22S1) Section 23.1, Test 10.0, See Figure
9 Right Bow "Closed" Switch (A23S1) Section 23.1, Test 11.0, See Figure
10 Left Front Soft Top "Locked" Switch (S84/1) Section 23.1, Test 12.0, See Figure
11 Right Front Soft Top "Locked" Switch (S84/2) Section 23.1, Test 13.0, See Figure
12 Soft Top Compartment "Open" Switch (S84/5) Section 23.1, Test 14.0, See Figure
13 Soft Top Fabric Bow "Raised" Switch (S84/6) Section 23.1, Test 15.0, See Figure
14 Soft Top "Open" Switch (Soft Top In Storage Compartment) Section 23.1, Test 16.0, See Figure
15 Soft Top "Raised" Switch (S84/4) Section 23.1, Test 17.0, See Figure
16 Roll Bar "Retracted" Switch (S83/1) Section 23.1, Test 18.0, See Figure
17 Left Front Door "Window Down" Limit Switch (S21/9) Section 23.1, Test 19.0, See Figure
18 Right Front Door "Window Down" Limit Switch (S21/8) Section 23.1, Test 20.0, See Figure
19 (3) Vehicle Speed Sensor (VSS) Signal Section 23.1, Test 21.0, See Figure
20 Hard Top Recognized As Installed On Vehicle Section 23.1, Test 22.0, See Figure
21 Power Soft Top Switch (S84) Section 23.1, Test 23.0, See Figure
22 Roll Bar Switch (Manual Operation) Section 23.1, Test 24.0, See Figure
23 Roll Bar Control Module (Crash Deployment) (N53) Section 23.1, Test 25.0, See Figure
24 Roll Bar Crash Deployment Section 23.1, Test 26.0, See Figure
25 Unlogical Limit Switch Signals (Check Limit Switches Using Diagnostic Mode) Section 23.1, Test 27.0, See Figure
26 Operation Time Span Exceeded Section 23.1, Test 28.0, See Figure
27 Low Voltage Section 23.1, Test 29.0, See Figure
28 Speedometer Signal Is Missing Section 23.1, Test 30.0, See Figure
29 Vehicle Speed Sensor (VSS) Signal (Wheel Speed) (ABS Control Module) Missing Section 23.1, Test 31.0, See Figure
30 Soft Top Function Locked Section 23.1, Test 32.0, See Figure
(1) To check for fault codes. See READING & CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM (SECTION 12).
(2) Before proceeding with indicated test step(s), it is essential that PREPARATION FOR TESTING & CONNECTING ELECTRICAL TEST EQUIPMENT is observed. Failure to properly connect test equipment may lead to incorrect diagnosis or personal injury. See PREPARATION FOR TESTING  . For test equipment hook up. See CONNECTING ELECTRICAL TEST EQUIPMENT  under ELECTRICAL DIAGNOSTIC TESTS (SECTION 23). Return to fault code table and continue to indicated test/step(s).
(3) Vehicle Speed Sensor (VSS) is found to be unlogical (only retrievable with control module version 7.6) (when using the dynamometer or brake test equipment, operation of the soft top is locked. When reading out the impulse scan tool DTC's, the DTCs 19 or 28 or 29 and 30 are given. If the vehicle is subsequently driven for more then 10 seconds, the soft top function is again possible. DTCs 19 or 28 or 29 remain in memory, erase impulse indication).
ROLL BAR CRASH DEPLOYMENT DIAGNOSTIC TROUBLE CODE DEFINITIONS

Impulse Readout/DTC (1) Possible Cause (2) Test Step/Remedy
1 No Malfunction Stored - - - -
2 Roll Bar Crash Actuation Trigger Module (N53) Section 23, Test 2.0, See Figure
3 Voltage Supply Section 23, Test 3.0, See Figure
4 Driver Seat Belt Lock Relay (K18/2), Open Circuit, Short Circuit To Terminal 30 And/Or 31 Section 23, Test 4.0, See Figure
5 Passenger Seat Belt Lock Relay (K18/3), Open Circuit, Short Circuit To Terminal 30 And/Or 31 Section 23, Test 5.0, See Figure
6 Roll Bar Deployment Solenoid (Y57/1), Open Circuit, Short Circuit To Terminal 30 And/Or 31 Section 23, Test 6.0, See Figure
7 Left And/Or Right Rear Axle Switch, Roll Bar (S83/2, S83/3), Short Circuit To Terminal 30 And/Or 31 Section 23, Test 7.0, See Figure
8 Roll Bar Warning Lamp (A1e29) Section 23, Test 8.0, See Figure
9 SRS Warning Lamp And/Or Impulse Counter Button Held Too Long To Erase Malfunctions Section 23, Test 6.0, See Figure
10 (3) SRS Control Unit (N2/2) Section 23, Test 7.0, See Figure
(1) To check for fault codes. See READING & CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM (SECTION 12).
(2) Observe preparations for testing. See ROLL BAR - PREPARATION FOR TESTING (UP TO 8/95)  under CONNECTING ELECTRICAL TEST EQUIPMENT under ELECTRICAL DIAGNOSTIC TESTS (SECTION 23). Failure to properly connect test equipment may lead to incorrect diagnosis or personal injury. Observe Warnings, Cautions and Notes under ROLL BAR CRASH DEPLOYMENT ELECTRICAL TESTS (UP TO 5/95 - SECTION 19.2/23)  , before proceeding with test steps.

(3) Impulse display 10 indicates that the AIRBAG deployment drivers in the control unit were activated. This impulse readout cannot be erased. The control unit must be replaced.