Test plan for the backrest adjustment device
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In the case of the complaint "backrest adjustment does not function", proceed according to test plan. As the seat functions vary, the test plan principally complies with the seat version with seat memory adjustment. Work aids: Use wiring diagram and multimeter. See TOOLS .
TEST PLAN FOR BACKREST ADJUSTMENT DEVICE
| Work instruction | Correct result | Incorrect result | |
|---|---|---|---|
| 1 | Actuate switch positions on seat for backrest adjustment. | Switch in the control module and electric motor function are audible Step 3 | Step 2 |
| 2 | Check fuse in the fuse box for the backrest adjustment. | Step 4 | Replace fuse and perform function test -> End |
| 3 | Take cover partly of the backrest and check drive for backrest adjustment. See REMOVING AND INSTALLING BACKREST CENTRE STRIP . | Repair -> End |
|
| 4 | Measure the battery voltage on plug X 16/X 17 without memory or terminals 30 and 31 on the memory SG (see wiring diagram) using a multimeter. | > 11V, when switching from front - back, the voltage changes from + to - Step 4 If a function is not audible under step 1, replace the control module memory. |
If the battery voltage is only displayed briefly on the multimeter Step 6. Replace at 0 V switch -> End |
| 5 | Measure the voltage on the inserted plug for the backrest adjustment (on control module memory or below the seat - without memory) using a multimeter. Actuate the backrest adjuster switch with probe tip + on GR/BK and with probe tip - on GR/GN. | > 4 V, when switching from front - back, the voltage changes from + to - Step 6 | Replace switch -> End |
| 6 | Partly remove backrest cover, check wiring harness and battery voltage on the electric motor. On inserted plug, probe tip + on BL - on BK. See REMOVING AND INSTALLING BACKREST CENTRE STRIP . | > 11V | Replace motor for the backrest adjustment -> End |