AD83.70-W-6000-17A | AHE test of electrical system auxiliary heater control module supply voltage |
| Scope of test | Measuring instrument/ Test connection | Operation/Requirement | Specified value | Possible cause/Remedy | ||
1.0 | Control unit (Z14) Voltage supply |
B4 B4 | Z14 Z14 |
B3 B8 | Ignition: ON Heater unit: ON Connect measuring instrument to plug connection B on control unit (Z14). Carry out measurements one after the other. | 22.529.5 V | Plug / cable (–//–) to timer (S124) Check fuse F7/A5 Ground connection / ground cable (–//–) to control unit (Z14) Plug connection / cable (–//–) to fuse carrier Check fuse F6/A5 Open-circuit or fault on/in control unit (Z14) Inspect plug connection on control unit (Z14) Replace control unit (Z14) on trial if necessary |