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  W211 Dual Battery System W211 Dual Battery System 219 BCM (ACB-ICC) 11-29-02…
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  To help avoid personal injury to you or others, and to avoid damage to the vehicle on which you are working, you must always refer to the latest Mercedes-Benz Technical Publication and follow all pertinent instructions when testing, diagnosing or making repair.
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  Program Highlights Program Highlights • Power distribution — pre-fuse diagram — pre-fuse locations • Dual battery on-board electrical system components — systems battery — auxiliary battery — battery control module — auxiliary battery relay — cut-off relay for interruptible loads •…
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  W211 Dual Battery System Function W211 Dual Battery System Function An auxiliary battery supplies electrical energy for a limited time if the systems battery voltage is low.
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  Systems Battery (G1) Systems Battery (G1) Location: (G1) installed in trunk…
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  W211 Systems Battery (G1) W211 Systems Battery (G1) • Systems Battery: 12V, 95 Ah, 520A (DIN) • Absorbent Glass Mat (AGM) design, also known as Valve Regulated Lead Acid (VRLA) type • Function — Primary power source for all vehicle electrical systems…
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  Location of Auxiliary Battery (G1/7) Location of Auxiliary Battery (G1/7) Auxiliary battery installed below air intake of HVAC…
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  Location of Auxiliary Battery (G1/7) Location of Auxiliary Battery (G1/7) Shown with HVAC air intake / filter removed…
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  Auxiliary Battery (G1/7) Auxiliary Battery (G1/7) • Auxiliary Battery: 12V, 12Ah, 170 A (DIN) • Absorbent Glass Mat (AGM) design • Function — Provides supplemental power if systems battery (G1) voltage is low…
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  AGM / VRLA Battery Properties AGM / VRLA Battery Properties • Longer service life • Improved cold starting characteristics • Improved deep cycle performance • No liquid acid spills or leaks • Fast recharge time • Completely maintenance free…
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  AGM / VRLA Battery Testing • Requires the new Midtronics MCR 717 tester and printer • Tester measures battery conductance by inducing A/C voltage of a given frequency and amplitude on the battery posts and monitoring the current flow in response to it •…
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  Front Pre-fuse (F32) Front Pre-fuse (F32) 72 73 74 75 76 77 Location: Passenger footwell…
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  Pre-fuse Box (F33) Pre-fuse Box (F33) Location: Front of spare tire well…
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  Pre-fuse Power Distribution Pre-fuse Power Distribution N10/1 200 A Res. N10/2 200 A N10/1 40 A 150 A N10/11 40 A 150 A 40 A A7/3 40 A A7/3 50 A M4/7 N112 and A35/11 150 A X58/1 150 A M40/1 40 A Res.
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  Legend: Pre-fuse Block Power Distribution Legend: Pre-fuse Block Power Distribution A7/3 Traction system hydraulic unit A35/11 Voice recognition module (VCS) Front pre-fuse box Rear pre-fuse box Interior fuse box (left of instrument panel) Systems battery G1/7 Auxiliary battery Alternator K57/2 Auxiliary battery relay AIRmatic relay N10/1…
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  Battery Control Module (N82) Battery Control Module (N82) Location: Rear of spare tire well…
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  Function of N82 Function of N82 1. Monitors the voltages of (G1) and (G1/7) 2. Monitors alternator voltage (terminal 61) via CAN B 3. Controls auxiliary battery relay (K57/2) 4. Controls consumer prioritization function 5. Optimizes charging of auxiliary battery (G1/7) 6.
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  Auxiliary Battery Relay (K57/2) Auxiliary Battery Relay (K57/2) Location: Below windshield wiper cowl plastic trim Function: • Controlled by N82 • De-energized during normal operation (N.O.) • Energized to recharge G1/7 • Energized if engine running and system voltage low •…
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  Cut-off Relay for Interruptible Loads (K75) Cut-off Relay for Interruptible Loads (K75) Location: LF SAM (N10/1) Function: • Controlled by N82 • De-energized during normal operation (N.C.) • Energized during emergency operation • Opens 30/15R to cigar lighter (R3r1), and 12V socket (X58/1) rear of center console during emergency operation…
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  Normal Mode Normal Mode — Battery control module monitors Kl . 30 voltages and calculates the CAN-B condition of both batteries — Monitors total current Kl . 31 consumption through common ground G1/7 — Consumer prioritization off — Relay K57/2 de-energized K57/2 Battery K57/2…
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  Multi-Function Display Fault Messages Multi-Function Display Fault Messages…
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  Consumer Prioritization Consumer Prioritization If, for example, the alternator fails: • Both consumer prioritization stages (1 and 2) are immediately activated via the CAN • A red warning info appears in the instrument cluster • The auxiliary battery is not engaged until G1 voltage is low If, for example, N82 determines the load capacity of systems battery (G1) is inadequate: •…
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  Emergency Mode Emergency Mode Engine running, systems battery low: Kl . 30 CAN-B — Consumers deactivated in 2 stages by CAN messages Kl . 31 — Fault messages in instrument cluster indicate deactivation of G1/7 consumers — Auxiliary battery relay (K57/2) is energized.
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  Auxiliary Battery Charging Mode Auxiliary Battery Charging Mode — Battery control module detects Kl . 30 insufficient voltage at auxiliary CAN-B battery — Auxiliary battery relay (K57/2) is Kl . 31 activated for a short period of time if primary system voltage is G1/7 above 13.5V — Auxiliary battery is charged…
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  Dual Battery System Diagram CAN B Dual Battery System Diagram CAN B N10/1 — circuit 61 — ignition key inserted — diagnosis — systems battery sensing N10/2 — trunk switch G1/7 — auxiliary battery sensing — warning messages…
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  Dual Battery Service Tips Dual Battery Service Tips Normalization: If the systems battery is disconnected or dead, the following systems should be checked for normal operation. If systems are inoperative or erratic then normalization will have to be performed. Potential systems requiring normalizing are: •…
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  Appendix Appendix Topic WIS doc.# AH54.10-P-0002-01A Notes on AGM battery construction, and properties AR54.10-P-1129-01A Battery test using Midtronics MCR717 OF58.40-P-3000-04A Order form for Midtronics MCR717 GF54.10-P-4201T Auxiliary battery relay, location, and function GF54.10-P-1001T Two-battery vehicle power supply, function GF54.21-P-4121-02T Vehicle power supply control module, task ETM doc # PE54.15-P-2502DA Pre-fuse F32 wiring diagram…