Test Requirements
Ensure battery is okay. Ensure all fuses are okay, battery voltage is at least 11.5 volts and fuel pump relay is
okay. Ensure all electrical accessories are off and A/C is off.
Test Procedure
1. Check Climate Control Module (J255) for DTC(s). See appropriate AUTOMATIC A/C-HEATER
SYSTEM article, under HVAC. If no DTCs are present, go to next step. If DTC(s) are present, repair as
necessary. After repairs, erase DTC memory. Verify repair. Test is complete. Perform ECM relearn
procedure. See TEST DRIVE RELEARN PROCEDURE .
2. Check wiring between Climate Control Module (J255) and ECM (J220) for open or short circuits. See
appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING
DIAGRAMS. See Fig. 61 , Fig. 62 and Fig. 63 . If wiring is okay, go to next step. If wiring is not okay,
repair as necessary. After repairs, erase DTC memory. Verify repair. Test is complete. Perform ECM
relearn procedure. See TEST DRIVE RELEARN PROCEDURE .
3. Check centralized matching resistor in ECM. Turn ignition off. Connect ECM to test box, leave ECM
harness connector disconnected from test box. Connect Test Box (VAG 1598/31). See CONNECTING
VAG TEST BOX . Using DVOM, check resistance between test box sockets No. 58 and 60. Resistance
should be 60-72 ohms. If resistance is not okay, replace faulty ECM. See ENGINE CONTROL
MODULE REMOVAL & INSTALLATION . After repairs, erase DTC memory. Verify repair. Test is
complete. Perform ECM relearn procedure. See TEST DRIVE RELEARN PROCEDURE .
DTC P1636/18044: DRIVETRAIN DATA BUS - NO SIGNAL FROM AIRBAG CONTROL MODULE
SYSTEM WIRING DIAGRAMS article in ELECTRICAL and ECM GROUND &
VOLTAGE SUPPLY .
NOTE:
Engine control module communicates with all control modules capable of
transferring data via a CAN (Controller Area Network) data bus. Data bus-
compatible control modules are connected together via two data bus wiring
twisted together (CAN high and CAN low) and exchange information
(messages). If information is not available in the CAN data bus from any one of
the control modules in the CAN data bus system it will be recognized as a
malfunction by the engine control module as well as other CAN data bus control
modules. The CAN data bus requires a matching resistor to function fault-free.
This central matching resistor is located in the engine control module.
NOTE:
Automatic A/C-Heater SysteM is referred to by Volkswagen as the Climatronic
system and is a fully automatic climate control system.
NOTE:
Instrument Cluster Control Module (J285) and Can Data Bus OBD Interface
(J533) are integral parts of the instrument cluster. If instrument cluster is
replaced, Can Data Bus OBD Interface (J533) must be coded. See CAN DATA
BUS OBD INTERFACE (J533) CODING .
2003 Volkswagen New Beetle GLS
2002-2003 ENGINE PERFORMANCE Self-Diagnostics - 1.8L Turbo
Helpmelearn Repair Manuals
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