Mercedes-Benz ML320. Manual — part 17

Fig. 5: Hand Held Tester Graphic Information (2000 Models)
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

FAULT CODES

Fig. 6: Diagnostic Trouble Code (DTC) Memory (2000 Models-1 Of 4)
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

2001 Mercedes-Benz ML320

2000-01 ACCESSORIES/SAFETY EQUIPMENT Mercedes-Benz - Air Bag Restraint Systems

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Fig. 7: Diagnostic Trouble Code (DTC) Memory (2000 Models-2 Of 4)
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig. 8: Diagnostic Trouble Code (DTC) Memory (2000 Models-3 Of 4)
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

2001 Mercedes-Benz ML320

2000-01 ACCESSORIES/SAFETY EQUIPMENT Mercedes-Benz - Air Bag Restraint Systems

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Fig. 9: Diagnostic Trouble Code (DTC) Memory (2000 Models-4 Of 4)
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

CLEARING FAULT CODES

Connect Hand-Held Tester (965 589 00 01) to Data Link Connector (DLC). DLC is located in right rear corner
of engine compartment. It may be necessary to use Adapter (965 589 00 40 or 965 589 00 50) to connect HHT
to DLC. After HHT displays module number and version, press return key to start sequence. Using HHT,
follow HHT prompts to clear SRS fault codes. SRS codes are clear when ignition is turned on and SRS warning
light functions normally. See SYSTEM OPERATION CHECK .

UNDERSTANDING DIAGNOSTIC CHART INFORMATION

SRS & ETR Diagnosis Chart Column Identification

First column of chart identifies TEST STEP (1.0 for example). See Fig. 10 . Second column of chart identifies
HHT fault code (017, 003 for example). First code in column is for vehicles without side air bags. Second code
in column (when listed) is for vehicles with side air bags only. Other 5 columns are self-explanatory.

Using SRS & ETR Diagnosis Chart

For reading and understanding fault code diagnosis chart, use the following example: Read test step 3.0 (first
column), HHT fault Code 002, 004 (second column). See Fig. 10 . Read TEST SCOPE-HHT ACTUAL
VALUE NO.-TEXT column (third column). Driver-side air bag squib connector R12-3 is being tested. HHT
will identify if problem is with too much resistance or not enough resistance in driver-side air bag squib circuit.
Read TEST CONDITION column (fifth column). Test circuit with HHT connected to DLC, with ignition in
position "2". Read NOMINAL VALUE-HHT DISPLAY column (sixth column). HHT will display a check or
an "F". If HHT displays a check, circuit is okay. If HHT displays an "F", go to step 3.1.

Read TEST CONNECTION (NOT FOR HHT) column (forth column). Driver-Side air bag squib connector
R12-3, terminals No. 1 and 2 are identified. Read TEST CONDITION column. Test circuit with HHT
connected to DLC and ignition key removed. Remove driver-side air bag module. Disconnect driver-side air
bag module squib connector R12-3. Connect Resistance Substitution Unit (124 589 09 63) to driver-side air bag
module squib connector (harness side). Set resistance substitution unit to 2 ohms. Turn ignition key to position
"2". Read NOMINAL VALUE-HHT DISPLAY column. If HHT displays a check, replace driver-side air bag

NOTE:

Refer to table to properly identify components or connectors being tested. See
COMPONENT IDENTIFICATION table.

2001 Mercedes-Benz ML320

2000-01 ACCESSORIES/SAFETY EQUIPMENT Mercedes-Benz - Air Bag Restraint Systems

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module. If HHT displays an "F", go to step 3.2.

Read TEST CONNECTION (NOT FOR HHT) column. Horn-air bag clockspring connector A45x1, terminals
No. 1 and 2 are identified. Read TEST CONDITION column. Test circuit with HHT connected to DLC.
Remove ignition key. Connect Resistance Substitution Unit (124 589 09 63 00) to horn-air bag clockspring
connector A45x1. Set resistance substitution unit to 2 ohms. Read NOMINAL VALUE-HHT DISPLAY
column. If HHT displays a check, check horn-air bag clockspring for continuity. Replace horn-air bag
clockspring as necessary. If HHT displays an "F", go to step 3.4.

MODEL IDENTIFICATION

COMPONENT IDENTIFICATION

NOTE:

Some testing is identified by model number. Refer to table to identify models by
model number. See MODEL IDENTIFICATION table.

Model Number

Model

129

SL Class

140

S Class

163

M Class

170

SLK Class

202

C Class

203

C 240 & C 320

208

CLK Class

210

E Class

215

CL 500

220

S 430 & S 500

Component

Manufacturer's Designation

A1e15

SRS warning light

A45

Horn-air bag clockspring

A53

Driver-side air bag sensor

A54

Passenger-side air bag sensor

B41-1

Passenger-side seat occupied recognition sensor

N2-2

SRS control module

N2-7

SRS control module

N72e1

Automatic child seat recognition light

R12-1

Driver-side ETR squib connector

R12-2

Passenger-side ETR squib connector

R12-3

Driver-side air bag squib connector

R12-8

Passenger-side air bag squib connector

R12-9

Side air bag (driver-side) squib connector

R12-10

Side air bag (passenger-side) squib connector

R12-20

Passenger-side air bag squib

2001 Mercedes-Benz ML320

2000-01 ACCESSORIES/SAFETY EQUIPMENT Mercedes-Benz - Air Bag Restraint Systems

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