Preparation For Test

CAUTION: Injury hazard from pinching and crushing, in extreme cases extremities can even be severed when caught in the mechanism.
When working on components activated via hand, electrically via motors, hydraulically, pneumatically via linkages, it is possible that severe injury can result in the severing, pinching, or crushing of body parts.
Do not allow any body parts to be in the general area of the moving components.

Preparation for Function Test, Recalling Actual Values:
1. Review sections 12, 20, 21, 31
2. Fuses ok,
3. Battery voltage ok,
4. Connect the Hand-Held Tester (HHT) to X11/4, according to diagram. Connecting Tester Or Scanner, Reading and Erasing DTC Memory
5. Voltage supply for control module and CAN-data wiring ok, refer to Information Bus, System Diagnosis. Testing and Inspection
6. All CAN-data wiring contacted,
7. Ignition ON, or open relevant left door,
8. Additional test for seatback activation: vehicle speed < 5mph (Model 208 only).

NOTE: Function sequence:
The voltage-coded signals from the power seat switches (S91/1, S92/2) are read into the associated door control modules (N69/1, N69/2). The door control modules (N69/1, N69/2) send a CAN message to the associated ESA control module (N32/1, N32/2) which actuates the seat adjustment motors.

Protective measures:
- Supervise work.
- Do not reach into the moving mechanism at any time during any tests.
- Keep away from the moving mechanism of components which are being activated via the HHT and or directly via circuit 30.
- Ensure that all test cables are of sufficient length.

NOTE: Actual values and activations from one system may be stored in several control modules, therefore the actual values and activations of control modules which are relevant to the system should be retrieved. When retreiving actual values, all available actual values from the respective control module appear.

Abbreviations:
ESA L Electric seat adjustment, left
ESA R Electric seat adjustment, right
EIS Electronic ignition switch/lock control module (N73)
PSE Pneumatic system equipment (A37)
DCM 1 Front driver door control module (N69/1)
DCM 2 Front driver door control module (N69/2)

The abbreviations listed above are found in the second column of the following test table test steps and they indicate in which control module(s) the actual values or activations are stored.

Special Tools:

Test equipment
Description Brand, model, etc.
Digital multimeter Fluke models 23, 77 III, 83, 85, 87